P0171 lean bank 1

x2 Oct 25, 2016 · 22,508 Posts. #2 · Oct 25, 2016. The downstream 02 sensors you replaced don't do anything for that code (P0171). The downstream are only being looked at to gauge the catalytic converter efficiency. It's the UPstream o2 sensors that monitor lean/rich conditions. The passenger side upstream o2 sensor would be the suspect in this case. Combustion engines run most efficiently when they maintain an air-fuel mixture ratio of 14.7 parts air to 1 part fuel. Too much fuel and/or too little air results in the engine running rich setting a P0172 trouble code, while too little fuel and/or too much air results in the engine running lean resulting in a check engine light for the Toyota P0171 code.Feb 06, 2010 · After researching for a week or so I haven't really found a definitive answer for the p0171 code (lean bank 1). The actual symptoms of this code are presently rough cold starting. Throttle response seems excellent once it is warmed up, though the idle can be a little rough it is nothing that say a novice would probably even notice. Feb 26, 2004 · P0171 is a generic OBD2 trouble code indicating the car is running lean. On a V-6 or V-8, bank 1 is the drivers side or the front group of cylinders depending on if the engine is inline mounted like a Crown Vic or transverse mounted like the third generation Altimas. P0174 indicates the other side group of cylinders. Sep 28, 2018 · There are lots of things that can cause a P0171 lean condition code. It means that the computer is adding fuel to compensate for a lean condition that it sees. It's important to know your vehicle, though, too. The gen 2 Odys only have one bank for emissions reporting purposes since there is only one set of O2 sensors. Nov 06, 2005 · I got check light on in my 00 RX300 (currently only 21000 miles) and ran a computer scan at Auto Zone today. The error code is P0171..System too lean (Bank 1). Vehicle Application: 1999 4Runner 3.4 2000 Tacoma 3.4. Customer Concern: Check engine light is ON. Lean code P0171, but the engine is running very rich. California emissions. Tests/Procedures: 1. Verify battery voltage to the A/F ratio sensor heater on the White/Red wire on the harness side with the key ON.empirefalls said: my turn on P0171 Fuel System Too Lean - Bank 1. Every cold weather season,the code occurs with cold weather. The code goes away after a couple of days, Comes back again,then goes away. Then its spring time. This has gone on for 2 yaars. Its cold again, the code came on 3 days ago, it went out today.Jan 07, 2021 · It has long tube headers (with cats), KNN cold air induction and Hurst short throw shifter. Since purchase I have replaced the clutch, radiator, starter and the crankcase position sensor. Now, I have this P0171 bank 1 lean code. Actions taken so far: Cleaned KNN filter, tightened up all couplings and pipes. Cleansed MAF sensor. P0171 is triggered by the engine bank 1 "upstream" oxygen sensor and P0174 is triggered by the engine bank 2 "upstream" oxygen sensor. The oxygen sensor alerts your system when the condition is too lean meaning there's too much oxygen in the exhaust. The symptoms and causes will help you determine the exact issue and how to fix it.This is one of the most common trouble codes in V-6 and larger engines. P0171 is a "System Too Lean (Bank 1)," which is triggered by the first exhaust oxygen (02) sensor (aka upstream 02 sensor) on the "Bank 1" side of the engine (designated as whichever side has cylinder number one). The Air-To-Fuel Mix The P0171 error code's main definition is "System Too Lean (Bank 1)." To better understand this definition, it is crucial for you to go through the basics that involve when your fuel is lean versus when it's too rich. We will cover this basic in the following section to help you determine whether the P0171 error code is serious or not.Aug 16, 2014 · P0171 & P0174 Fuel Trim System Lean Bank 1 & 2. Thread starter Micholder; Start date Aug 16, 2014; Aug 16, 2014 #1 M. Micholder Junior Member. Joined Apr 25, 2014 Posts 7 Sep 28, 2018 · There are lots of things that can cause a P0171 lean condition code. It means that the computer is adding fuel to compensate for a lean condition that it sees. It's important to know your vehicle, though, too. The gen 2 Odys only have one bank for emissions reporting purposes since there is only one set of O2 sensors. The P0171 code means that the Oxygen (O2) sensor on bank 1 recognized a too lean mixture to correct it. The Oxygen O2 sensors have the ability to correct a fuel mixture of +-15%. If it needs to correct the air-fuel mixture more than that, the P0171 code will be stored. P0171 SymptomsP0171 Bank 1 lean P0171 is a very common code for any ODB2 vehicle. What does this code mean anyway? The definition for this this P0171 code is Fuel Trim System Lean (Bank 1) . I have have been dealing with this P0171 diagnostic trouble code for many years on many different year make and model vehicles.Nov 06, 2005 · I got check light on in my 00 RX300 (currently only 21000 miles) and ran a computer scan at Auto Zone today. The error code is P0171..System too lean (Bank 1). | P0171 FORD code tech notes If the P0171 is combined with the P0174 code, the problem is likely caused by an intake leak or the Intake Plenum Gasket and seals. If there are no intake leaks, the next step is to replace the air filter and clean the airflow meter. If the problem persists, the front oxygen (O2) sensor may need to be replaced.Troubleshooting P0171 And P0174 (Ford 4.6L, 5.4L) This article will help you to diagnose diagnostic trouble code P0171 (System Too Lean Bank 1) and/or P0174 (System Too Lean Bank 2) on your Ford, Mercury or Lincoln 4.6L or 5.4L equipped car, pick up, van or SUV. Although you can apply this info to any Ford vehicle with a V6 or V8, this info ...The P0171 code means that more air than gasoline is detected in the exhaust gases exiting the combustion chamber. If the P0171 is set in along with the P0174 code, it is highly likely that the problem is caused by an intake leak. If there are no intake leaks, the next step is to replace the air filter and clean the Mass Air Flow (MAF) Sensor.Feb 21, 2022 · Combustion engines run most efficiently when they maintain an air-fuel mixture ratio of 14.7 parts air to 1 part fuel. Too much fuel and/or too little air results in the engine running rich setting a P0172 trouble code, while too little fuel and/or too much air results in the engine running lean resulting in a check engine light for the P0171 code. P0171-Powertrain System too Lean (Bank 1) Parvaiz Iqbal, Sep 3, 2019, in forum: Gen 2 Prius Technical Discussion. Replies: 1 Views: 2,759. SFO Sep 3, 2019. P0171 code and fuel gauge went from half to 1 blinking bar instantly. Shavisno, Jul 13, 2019, in forum: Gen 2 Prius Technical Discussion. Replies: 2 Views:Jan 31, 2013 · Codes P0171 & P0174 (Too lean bank 1 & Too lean bank 2) Asked by MtnHiker Jan 31, 2013 at 08:20 AM about the 2002 Jaguar X-TYPE 2.5L AWD. Question type: Maintenance & Repair. I have checked all vacuum lines, sprayed carb cleaner around MAP sensor, Intake manifold gaskets, between throttle body and manifold and around all vacuum points. P0171 - System Too Lean (Bank 1) P0174 - System Too Lean (Bank 2) Basically this means that an oxygen sensor in bank 1 detected a lean condition (too much oxygen in the exhaust). On V6/V8/V10 engines, Bank 1 is the side of the engine that has cylinder #1. Note: This DTC is very similar to P0174, and in fact your vehicle may show both codes at ...Dec 27, 2010 · The code indicates lean fuel at O2 sensors but is attributed to a vacuum leak. Mine was at the back of the Vacuum Brake booster. Try blowing smoke into vacuum system on engine off and look for exit points. Or spraying a bit of propane near the suspected leak to see if engine speed changes while running the engine. Jan 07, 2021 · It has long tube headers (with cats), KNN cold air induction and Hurst short throw shifter. Since purchase I have replaced the clutch, radiator, starter and the crankcase position sensor. Now, I have this P0171 bank 1 lean code. Actions taken so far: Cleaned KNN filter, tightened up all couplings and pipes. Cleansed MAF sensor. See full list on obd-codes.com This lean mixture can either be short term or long term. If the lean mixture is a short term one, it means that the fuel mixture is usually very lean. Otherwise, for long-term lean mixture, the code p0171 is registered according to an indication of the lean mixture through time. By design, these O2 sensors typically come with a +/- 15% range.Nov 09, 2017 · Positive numbers mean the ECU is adding extra fuel. The numbers seem counterintuitive to your Bank1 lean code. Actually they're right in line with the lean code: it's running lean, so the ECU is adding more fuel to compensate. OP, as suggested use carb cleaner or propane, etc. to see if you can find a vacuum leak. P0171 is an OBDII trouble code. The code technically stands for: Fuel Trim System Lean Bank 1. The code is thrown when the oxygen sensors detect that there's not enough oxygen in the exhaust system. This is commonly referred to as a "lean" condition. The vehicles ECM will add more fuel to the mixture in order to bring the air fuel mixture ...Causes of P0171 VW/Audi Engine Code. Vacuum Hose Leaks. Failing Positive Crankcase Ventilation (PCV) Valve. Faulty High-Pressure Fuel Pump. Ignition misfires ( Fault Codes: P0300, P0301, P0302, P0303, P0304) Intake Air Leak (Fault Code: P0174) Faulty O2 Sensor. Faulty Mass Air Flow (MAF) Sensor. Maintenance Shop - P0171 (Bank 1 lean), P0175 (Bank 2 rich) at sametime - Original problem was running rough and no power with codes P0301, P0306, P0305 & P0306. I changed out the ignition coil, and all plugs, verified wires good. Little to no change, still runs rough. I can pull a plug wire off cylinders 1 through 3...Jul 10, 2021 · Updated: July 10, 2021. The OBDII trouble code P0171 - System Too Lean (Bank 1) means that the engine air-fuel mixture is too lean, or there is too much air and too little fuel. Driving a car with the code P0171 can cause more damage to the engine over time, as when the engine runs lean, the combustion temperature is higher.. Ir pieejams rūpnīcas servisa biļetens šādiem ...Positive numbers mean the ECU is adding extra fuel. The numbers seem counterintuitive to your Bank1 lean code. Actually they're right in line with the lean code: it's running lean, so the ECU is adding more fuel to compensate. OP, as suggested use carb cleaner or propane, etc. to see if you can find a vacuum leak.The shorter-term for the system is too lean in bank 1 is code P0171. This code means that the system is running weakly on the first engine bank and is unable to properly deliver the correct amount of fuel to power the engine.Fast forward to this January, I was driving home from work when the check engine light came on. Using my tool, I saw that it was a P0171-00 "System too lean (bank 1)". I opened the hood and looked around, but didn't see anything amiss, reset the code and went in and researched (I sometimes get random suspension codes too, so didn't know if this ...Oct 29, 2021 · The P0171 is diagnostic trouble code for Engine is running lean. This can be due to un-metered air leaking or vacuum leak into the air in-take. It can also be due to a dirty MAF sensor or faulty O2 sensor. Check the engine bay and the air in-take system. Check the MAF sensor and clean with MAF sensor cleaner only. Apr 06, 2015 · 2500 RPM = 3 or 4 PSI. 4500 RPM = 11 or 12 PSI. Interestingly, my car was also ONLY throwing the P0171, which indicates bank 1. Yet the worst cat was on bank 2. My theory is that since bank 2 was clogged, the exhaust gases were making their way back through the head, using the secondary air path in the head, and past the bank 1 O2 sensor, where ... Jan 31, 2013 · Codes P0171 & P0174 (Too lean bank 1 & Too lean bank 2) Asked by MtnHiker Jan 31, 2013 at 08:20 AM about the 2002 Jaguar X-TYPE 2.5L AWD. Question type: Maintenance & Repair. I have checked all vacuum lines, sprayed carb cleaner around MAP sensor, Intake manifold gaskets, between throttle body and manifold and around all vacuum points. Nov 09, 2017 · Positive numbers mean the ECU is adding extra fuel. The numbers seem counterintuitive to your Bank1 lean code. Actually they're right in line with the lean code: it's running lean, so the ECU is adding more fuel to compensate. OP, as suggested use carb cleaner or propane, etc. to see if you can find a vacuum leak. Oct 25, 2016 · 22,508 Posts. #2 · Oct 25, 2016. The downstream 02 sensors you replaced don't do anything for that code (P0171). The downstream are only being looked at to gauge the catalytic converter efficiency. It's the UPstream o2 sensors that monitor lean/rich conditions. The passenger side upstream o2 sensor would be the suspect in this case. 2,122 Posts. Discussion Starter · #1 · Sep 13, 2016. so I've been battling a p0171 (lean bank one) code and I'm running out of ideas. I've replaced, the MAF sensor, bank one's A/F sensor, redid the IMS's gasket (might have stripped a bolt hole while) replaced the PCV, checked all the intake hoses, and still have the code. maybe the camshaft ...P0171 is a generic OBD2 trouble code indicating the car is running lean. On a V-6 or V-8, bank 1 is the drivers side or the front group of cylinders depending on if the engine is inline mounted like a Crown Vic or transverse mounted like the third generation Altimas. P0174 indicates the other side group of cylinders.Oct 03, 2008 · The Subaru Diagnostics for P0171 (Lean) and P0172 (Rich) are the same.. Would seem that filling the tank is causing some sort of problem with the fuel pressure. You don't mention a change of fuel filter (although may not be due at that service interval). Could be a failing pump. Dec 27, 2016 · A P0171 code usually is triggered by one or more of the following: * cracked or split vacuum line or PCV hose. * faulty PCV valve. * faulty MAP sensor. * exhaust leak forward of the first O2 sensor. Typically this is caused by a cracked intake manifold gasket on an exhaust port. In some cases (but not normally) it can also indicate a faulty O2 ... Oct 25, 2016 · 22,508 Posts. #2 · Oct 25, 2016. The downstream 02 sensors you replaced don't do anything for that code (P0171). The downstream are only being looked at to gauge the catalytic converter efficiency. It's the UPstream o2 sensors that monitor lean/rich conditions. The passenger side upstream o2 sensor would be the suspect in this case. Oct 22, 2019 · The computer measures that amount and makes sure that the right fuel is mixed with it so it gets burned properly. So if more air actually comes in than is measured, it is usually because of a leak somewhere and that could cause a P0171. The system is said to run "lean" - there's too much air and too little fuel. Oct 29, 2021 · The P0171 is diagnostic trouble code for Engine is running lean. This can be due to un-metered air leaking or vacuum leak into the air in-take. It can also be due to a dirty MAF sensor or faulty O2 sensor. Check the engine bay and the air in-take system. Check the MAF sensor and clean with MAF sensor cleaner only. 11 Posts. #13 · Apr 6, 2021. gdog26 said: Hello, I've the following code at the moment P0171 System too lean BANK 1. 2006 GMC Canyon 3.5L 4x4 automatic. 2 weeks ago I did the following because I had this code P0449 (which is now fixed, the EVAP solenoid valve has been replaced with a new one) The following was done (in order) 1) replaced the ...Aug 12, 2013 · Blackbalts. Possible that your o2 sensor is just bad and is reading lean which is forcing the engine to run rich as faq. Get the pump replaced first, then possibly look into replacing the o2 sensor (OEM only). Shouldn't be an issue with your injectors, but you could run some cleaner through to possibly rule that out. Joined Jun 4, 2015. 1,715 Posts. Discussion Starter · #1 · Dec 5, 2016. So while cruising on the highway tonight, popped a P0171 code, system too lean bank 1. Seeing that light come on scared the crap out of me, since I'm running E85 on the Throttle Happy tune. However, at this point, I am doubtful it is the tune to blame.Combustion engines run most efficiently when they maintain an air-fuel mixture ratio of 14.7 parts air to 1 part fuel. Too much fuel and/or too little air results in the engine running rich setting a P0172 trouble code, while too little fuel and/or too much air results in the engine running lean resulting in a check engine light for the Toyota P0171 code.Oct 20, 2021 · NOTE: Although code P0171 – “System too lean – Bank 1” refers to an air/fuel metering issue on Bank 1 of V-type engines, this code also applies to in-line engines that have only one “bank” of cylinders. Therefore, the “Bank 1” part of the definition can be ignored if code P0171 is present on a vehicle with an in-line engine. Aug 28, 2013 · Originally Posted by Baggio. P0171 - Bank 1 System Too Lean is back after the IM spacers install. Not sure what else it could be at this point. The vacuum system has been smoked for a previous EVAP problem that was occurring at the same time as this code and it came back as nothing leaking. P0171 is a diagnostic trouble code (DTC) for "System Too Lean (Bank 1)". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic for $114.99 . The P0171 code means that the Oxygen (O2) sensor on bank 1 recognized a too lean mixture to correct it. The Oxygen O2 sensors have the ability to correct a fuel mixture of +-15%. If it needs to correct the air-fuel mixture more than that, the P0171 code will be stored. P0171 SymptomsP0171 - System Too Lean (Bank 1) P0174 - System Too Lean (Bank 2) Basically this means that an oxygen sensor in bank 1 detected a lean condition (too much oxygen in the exhaust). On V6/V8/V10 engines, Bank 1 is the side of the engine that has cylinder #1. Note: This DTC is very similar to P0174, and in fact your vehicle may show both codes at ...570 Posts. #5 · Feb 10, 2020. A lean fuel condition may exist if the engine is sucking in too much air and/or the fuel system is not delivering enough fuel. If bad enough, a lean fuel condition may cause lean misfire, a rough idle, hesitation or stumble when accelerating, and/or poor engine performance.P0171 - System to lean bank 1 -permanent P2196 - o2 sensor biased/stuck rich bank 1 sensor 1 Hello and thanks for reading and the help. I picked up this car for my son to drive for college it's a 2013 Subaru Crosstrek used 101,250 miles. It appeared to not have the 100k maintenance done. So...In this video, I show you how I troubleshoot a Check Engine Light (CEL) / Diagnostic Trouble Code (DTC) P0171, System Too Lean Bank 1. The exact vehicle in ...Apr 12, 2017 · P0171 is triggered at 1.29 Lambda, so you should log your LTFT+STFT and make sure they are as close to zero as possible, ideally you want to be +/-2% at all times. Some fluctuation during decel is normal, but while driving you should be pretty close to zero. P0171 is a diagnostic trouble code (DTC) for "System Too Lean (Bank 1)". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic for $114.99 . Dec 27, 2010 · The code indicates lean fuel at O2 sensors but is attributed to a vacuum leak. Mine was at the back of the Vacuum Brake booster. Try blowing smoke into vacuum system on engine off and look for exit points. Or spraying a bit of propane near the suspected leak to see if engine speed changes while running the engine. 2,122 Posts. Discussion Starter · #1 · Sep 13, 2016. so I've been battling a p0171 (lean bank one) code and I'm running out of ideas. I've replaced, the MAF sensor, bank one's A/F sensor, redid the IMS's gasket (might have stripped a bolt hole while) replaced the PCV, checked all the intake hoses, and still have the code. maybe the camshaft ...| P0171 TOYOTA code tech notes If the P0171 is combined with the P0174 code, it's very likely that the problem is caused by an intake leak. If there are no intake leaks, the next step is to replace the air filter and clean the airflow meter. If the problem persists the front oxygen (O2) sensor may need to be replaced.570 Posts. #5 · Feb 10, 2020. A lean fuel condition may exist if the engine is sucking in too much air and/or the fuel system is not delivering enough fuel. If bad enough, a lean fuel condition may cause lean misfire, a rough idle, hesitation or stumble when accelerating, and/or poor engine performance.P0171 Bank 1 lean P0171 is a very common code for any ODB2 vehicle. What does this code mean anyway? The definition for this this P0171 code is Fuel Trim System Lean (Bank 1) . I have have been dealing with this P0171 diagnostic trouble code for many years on many different year make and model vehicles.Jan 12, 2010 · P0171 - System to Lean (Bank 1) The Adaptive Fuel Strategy continuously monitors fuel delivery hardware. The test fails when the adaptive fuel tables reach a rich calibrated limit. For lean and rich DTCs: Fuel system. Excessive fuel pressure. Leaking/contaminated fuel injectors. Leaking fuel pressure regulator. Feb 02, 2020 · P0171 Front Bank Lean. Codes P0171 Lean Bank One. P0171 - System Too Lean (Bank 1) Im not saying that it will 100% for sure answer your questions, but at least then you will have a better understanding of what is going and the things that people recommend and why. 97 GTP Sold-prolly rusted away by now. P0171 is a generic OBD-II diagnostic trouble code (DTC) defined as P0171 System too lean Bank 1. It’s a trouble code that your vehicle’s Powertrain Control Module (PCM) or Engine Control Module (ECM) logs and alerts via Check Engine Light when it detects a lean fuel mixture on Bank 1 of a V-type engine. A P0171 code indicating a lean ... This article will therefore deal with code P0171 as it applies specifically to GM vehicles. OBD II fault code P0171 is a generic trouble code that is defined as "System too lean - Bank 1" and is set when the PCM (Powertrain Control Module) detects an air/fuel mixture that is too lean on bank 1.Feb 26, 2004 · P0171 is a generic OBD2 trouble code indicating the car is running lean. On a V-6 or V-8, bank 1 is the drivers side or the front group of cylinders depending on if the engine is inline mounted like a Crown Vic or transverse mounted like the third generation Altimas. P0174 indicates the other side group of cylinders. empirefalls said: my turn on P0171 Fuel System Too Lean - Bank 1. Every cold weather season,the code occurs with cold weather. The code goes away after a couple of days, Comes back again,then goes away. Then its spring time. This has gone on for 2 yaars. Its cold again, the code came on 3 days ago, it went out today.Feb 26, 2004 · P0171 is a generic OBD2 trouble code indicating the car is running lean. On a V-6 or V-8, bank 1 is the drivers side or the front group of cylinders depending on if the engine is inline mounted like a Crown Vic or transverse mounted like the third generation Altimas. P0174 indicates the other side group of cylinders. A P0171 lean code for bank 1 is the cylinder bank on the RIGHT (passenger) side of the engine on Ford vehicles with a V6 or V8 engine and rear-wheel drive. A lean fuel condition may exist if the engine is sucking in too much air and/or the fuel system is not delivering enough fuel. If bad enough, a lean fuel condition may cause lean misfire, a ...11 Posts. #13 · Apr 6, 2021. gdog26 said: Hello, I've the following code at the moment P0171 System too lean BANK 1. 2006 GMC Canyon 3.5L 4x4 automatic. 2 weeks ago I did the following because I had this code P0449 (which is now fixed, the EVAP solenoid valve has been replaced with a new one) The following was done (in order) 1) replaced the ...Nov 06, 2005 · I got check light on in my 00 RX300 (currently only 21000 miles) and ran a computer scan at Auto Zone today. The error code is P0171..System too lean (Bank 1). P0171 is a "System Too Lean (Bank 1)," which is triggered by the first exhaust oxygen (02) sensor (aka upstream 02 sensor) on the "Bank 1" side of the engine (designated as whichever side has cylinder number one). The Air-To-Fuel Mix.This lean mixture can either be short term or long term. If the lean mixture is a short term one, it means that the fuel mixture is usually very lean. Otherwise, for long-term lean mixture, the code p0171 is registered according to an indication of the lean mixture through time. By design, these O2 sensors typically come with a +/- 15% range.jserrano. Check the fuel system pressure with the fuel pressure regulator vacumm hose connected and disconnected. The way I understand this diagnostic works is that the O2 sensor is receiving a lean reading and when the ECU tries changing the injector pulse the O2 continues to read a lean mixture. Reset the ECU and see if it comes back.Oct 25, 2016 · 22,508 Posts. #2 · Oct 25, 2016. The downstream 02 sensors you replaced don't do anything for that code (P0171). The downstream are only being looked at to gauge the catalytic converter efficiency. It's the UPstream o2 sensors that monitor lean/rich conditions. The passenger side upstream o2 sensor would be the suspect in this case. May 29, 2022 · The P0171 code means that more air than gasoline is detected in the exhaust gases exiting the combustion chamber. If the P0171 is set in along with the P0174 code, it is highly likely that the problem is caused by an intake leak. If there are no intake leaks, the next step is to replace the air filter and clean the Mass Air Flow (MAF) Sensor. Mar 16, 2011 · P0171 - System to Lean (Bank 1) The Adaptive Fuel Strategy continuously monitors fuel delivery hardware. The test fails when the adaptive fuel tables reach a rich calibrated limit. For lean and rich DTCs: Fuel system. Excessive fuel pressure. Leaking/contaminated fuel injectors. Leaking fuel pressure regulator. P0171 - System to lean bank 1 -permanent P2196 - o2 sensor biased/stuck rich bank 1 sensor 1 Hello and thanks for reading and the help. I picked up this car for my son to drive for college it's a 2013 Subaru Crosstrek used 101,250 miles. It appeared to not have the 100k maintenance done. So...The shorter-term for the system is too lean in bank 1 is code P0171. This code means that the system is running weakly on the first engine bank and is unable to properly deliver the correct amount of fuel to power the engine.Oct 20, 2021 · NOTE: Although code P0171 – “System too lean – Bank 1” refers to an air/fuel metering issue on Bank 1 of V-type engines, this code also applies to in-line engines that have only one “bank” of cylinders. Therefore, the “Bank 1” part of the definition can be ignored if code P0171 is present on a vehicle with an in-line engine. Codes P0171 & P0174 (Too lean bank 1 & Too lean bank 2) Asked by MtnHiker Jan 31, 2013 at 08:20 AM about the 2002 Jaguar X-TYPE 2.5L AWD. Question type: Maintenance & Repair. I have checked all vacuum lines, sprayed carb cleaner around MAP sensor, Intake manifold gaskets, between throttle body and manifold and around all vacuum points.I'm getting P0171 and P0174 codes on my 2000 MR2 Spyder. P0171 is System Bank 1 Lean, P0174 is System Bank 2 lean. If I'm getting both of these codes at the same time, could it mean I have some type of a vaccum leak? I have also read on other forums that there was a recall for the fuel injectors in some of the 2000 Toyotas. p0171 system too lean (bank 1) Jump to Latest Follow Status Not open for further replies. 1 - 20 of 22 Posts. 1; 2; Next. 1 of 2 Go to page. Go. B. bradman84 · Registered. Joined Apr 12, 2012 · 2 Posts . Discussion Starter · #1 · Apr 12, 2012. Only show this user ...jserrano. Check the fuel system pressure with the fuel pressure regulator vacumm hose connected and disconnected. The way I understand this diagnostic works is that the O2 sensor is receiving a lean reading and when the ECU tries changing the injector pulse the O2 continues to read a lean mixture. Reset the ECU and see if it comes back.Jun 12, 2013 · P0171: From the Service Manual. Vacuum hoses-split, kinked, improper connections. Insufficient fuel in tank. Low fuel pressure. Fuel contamination. Malfunctioning furl injectors. Missing, restricted, or leaking exhaust components. Vacuum leaks at the intake manifold, throttle body, or injector o-rings. Leaks in the air induction system and ... P0171 - System to Lean (Bank 1) The Adaptive Fuel Strategy continuously monitors fuel delivery hardware. The test fails when the adaptive fuel tables reach a rich calibrated limit. For lean and rich DTCs: Fuel system. Excessive fuel pressure. Leaking/contaminated fuel injectors. Leaking fuel pressure regulator.Jan 27, 2021 · OBD II fault code P0171 is a generic trouble code that is defined as “System too lean – Bank 1” and is set when the PCM (Powertrain Control Module) detects an air/fuel mixture that is too lean on bank 1. Note that in the context of this code, “system” refers to faults in the air/fuel metering system that cause, or contribute to an ... Fast forward to this January, I was driving home from work when the check engine light came on. Using my tool, I saw that it was a P0171-00 "System too lean (bank 1)". I opened the hood and looked around, but didn't see anything amiss, reset the code and went in and researched (I sometimes get random suspension codes too, so didn't know if this ...Nov 27, 2018 · 570 Posts. #5 · Feb 10, 2020. A lean fuel condition may exist if the engine is sucking in too much air and/or the fuel system is not delivering enough fuel. If bad enough, a lean fuel condition may cause lean misfire, a rough idle, hesitation or stumble when accelerating, and/or poor engine performance. Jan 12, 2010 · P0171 - System to Lean (Bank 1) The Adaptive Fuel Strategy continuously monitors fuel delivery hardware. The test fails when the adaptive fuel tables reach a rich calibrated limit. For lean and rich DTCs: Fuel system. Excessive fuel pressure. Leaking/contaminated fuel injectors. Leaking fuel pressure regulator. Jan 07, 2021 · It has long tube headers (with cats), KNN cold air induction and Hurst short throw shifter. Since purchase I have replaced the clutch, radiator, starter and the crankcase position sensor. Now, I have this P0171 bank 1 lean code. Actions taken so far: Cleaned KNN filter, tightened up all couplings and pipes. Cleansed MAF sensor. Jan 27, 2021 · OBD II fault code P0171 is a generic trouble code that is defined as “System too lean – Bank 1” and is set when the PCM (Powertrain Control Module) detects an air/fuel mixture that is too lean on bank 1. Note that in the context of this code, “system” refers to faults in the air/fuel metering system that cause, or contribute to an ... Feb 21, 2022 · Combustion engines run most efficiently when they maintain an air-fuel mixture ratio of 14.7 parts air to 1 part fuel. Too much fuel and/or too little air results in the engine running rich setting a P0172 trouble code, while too little fuel and/or too much air results in the engine running lean resulting in a check engine light for the P0171 code. Discussion Starter · #1 · Jun 2, 2017. I have a problem with my beast. It has a slight misfire and is down on power. It has a P0171 code system lean bank 1. I have seen lots if threads regarding both P0171 and P0174 but very little for just the one code. I have replaced the precat O2 sensors, changed the MAFs and checked for air leaks but ...Feb 02, 2020 · P0171 Front Bank Lean. Codes P0171 Lean Bank One. P0171 - System Too Lean (Bank 1) Im not saying that it will 100% for sure answer your questions, but at least then you will have a better understanding of what is going and the things that people recommend and why. 97 GTP Sold-prolly rusted away by now. Tech description. If the P0171 BMW is combined with the P0174 BMW code, it's very likely that the problem is caused by an intake leak. If there are no intake leaks, the next step is to replaced the air filter and clean the air flow meter. If the problem persist the front oxygen (O2) sensor may need to be replaced. 2006 Trailblazer P0171 BMW.Positive numbers mean the ECU is adding extra fuel. The numbers seem counterintuitive to your Bank1 lean code. Actually they're right in line with the lean code: it's running lean, so the ECU is adding more fuel to compensate. OP, as suggested use carb cleaner or propane, etc. to see if you can find a vacuum leak.Maintenance Shop - P0171 (Bank 1 lean), P0175 (Bank 2 rich) at sametime - Original problem was running rough and no power with codes P0301, P0306, P0305 & P0306. I changed out the ignition coil, and all plugs, verified wires good. Little to no change, still runs rough. I can pull a plug wire off cylinders 1 through 3...P0171 too lean bank one. Discussion in '1st Gen. Tacomas (1995-2004)' started by Danberry2242, Jul 3, 2017. Post Reply. Page 1 of 3 1 2 3 Next > Jul 3, 2017 at 6:12 PM #1 #1. ... too lean is most likely maf sensor or o2 sensors. allthough maf sensors usually pop a maf code. looks like stealership diag is in order. daryl lict, Jul 6, 2017 #3.P0171 is an OBDII trouble code. The code technically stands for: Fuel Trim System Lean Bank 1. The code is thrown when the oxygen sensors detect that there's not enough oxygen in the exhaust system. This is commonly referred to as a "lean" condition. The vehicles ECM will add more fuel to the mixture in order to bring the air fuel mixture ...Jun 12, 2013 · P0171: From the Service Manual. Vacuum hoses-split, kinked, improper connections. Insufficient fuel in tank. Low fuel pressure. Fuel contamination. Malfunctioning furl injectors. Missing, restricted, or leaking exhaust components. Vacuum leaks at the intake manifold, throttle body, or injector o-rings. Leaks in the air induction system and ... 11 Posts. #13 · Apr 6, 2021. gdog26 said: Hello, I've the following code at the moment P0171 System too lean BANK 1. 2006 GMC Canyon 3.5L 4x4 automatic. 2 weeks ago I did the following because I had this code P0449 (which is now fixed, the EVAP solenoid valve has been replaced with a new one) The following was done (in order) 1) replaced the ...empirefalls said: my turn on P0171 Fuel System Too Lean - Bank 1. Every cold weather season,the code occurs with cold weather. The code goes away after a couple of days, Comes back again,then goes away. Then its spring time. This has gone on for 2 yaars. Its cold again, the code came on 3 days ago, it went out today.Oct 22, 2019 · The computer measures that amount and makes sure that the right fuel is mixed with it so it gets burned properly. So if more air actually comes in than is measured, it is usually because of a leak somewhere and that could cause a P0171. The system is said to run "lean" - there's too much air and too little fuel. A P0171 lean code for bank 1 is the cylinder bank on the RIGHT (passenger) side of the engine on Ford vehicles with a V6 or V8 engine and rear-wheel drive. A lean fuel condition may exist if the engine is sucking in too much air and/or the fuel system is not delivering enough fuel. If bad enough, a lean fuel condition may cause lean misfire, a ...P0171 too lean bank one. Discussion in '1st Gen. Tacomas (1995-2004)' started by Danberry2242, Jul 3, 2017. Post Reply. Page 1 of 3 1 2 3 Next > Jul 3, 2017 at 6:12 PM #1 #1. ... too lean is most likely maf sensor or o2 sensors. allthough maf sensors usually pop a maf code. looks like stealership diag is in order. daryl lict, Jul 6, 2017 #3.The Subaru Diagnostics for P0171 (Lean) and P0172 (Rich) are the same.. Would seem that filling the tank is causing some sort of problem with the fuel pressure. You don't mention a change of fuel filter (although may not be due at that service interval). Could be a failing pump.May 25, 2022 · What does code P0171 mean? “Code P0171 – system too lean bank 1” means there is too much oxygen or too little fuel in the exhaust, which is referred to as a “lean” condition, or a lean or “low fuel trim” code. This can be caused by something like a disconnected hose or vacuum leak, which means there’s more air than usual, or ... Dec 27, 2010 · The code indicates lean fuel at O2 sensors but is attributed to a vacuum leak. Mine was at the back of the Vacuum Brake booster. Try blowing smoke into vacuum system on engine off and look for exit points. Or spraying a bit of propane near the suspected leak to see if engine speed changes while running the engine. P0171 Front Bank Lean. Codes P0171 Lean Bank One. P0171 - System Too Lean (Bank 1) Im not saying that it will 100% for sure answer your questions, but at least then you will have a better understanding of what is going and the things that people recommend and why. 97 GTP Sold-prolly rusted away by now.| P0171 TOYOTA code tech notes If the P0171 is combined with the P0174 code, it's very likely that the problem is caused by an intake leak. If there are no intake leaks, the next step is to replace the air filter and clean the airflow meter. If the problem persists the front oxygen (O2) sensor may need to be replaced.Oct 03, 2008 · The Subaru Diagnostics for P0171 (Lean) and P0172 (Rich) are the same.. Would seem that filling the tank is causing some sort of problem with the fuel pressure. You don't mention a change of fuel filter (although may not be due at that service interval). Could be a failing pump. P0171 Bank 1 lean P0171 is a very common code for any ODB2 vehicle. What does this code mean anyway? The definition for this this P0171 code is Fuel Trim System Lean (Bank 1) . I have have been dealing with this P0171 diagnostic trouble code for many years on many different year make and model vehicles.The P0171 code means that more air than gasoline is detected in the exhaust gases exiting the combustion chamber. If the P0171 is set in along with the P0174 code, it is highly likely that the problem is caused by an intake leak. If there are no intake leaks, the next step is to replace the air filter and clean the Mass Air Flow (MAF) Sensor.Check Light On...p0171 System Too Lean (bank 1) Check Light On...p0171 System Too Lean (bank 1) By kthan, November 6, 2005 in 99 - 03 Lexus RX300. Share More sharing options... Followers 0. Reply to this topic; Start new topic; Recommended Posts. kthan. Posted November 6, 2005. kthan. Regular Member; 6 Lexus Model: RX300 ...Lexus 2000 Rx300 P0171 System Too Lean Bank 1 Lexus 2000 Rx300 P0171 System Too Lean Bank 1. By Sami, August 17, 2006 in 99 - 03 Lexus RX300. Share More sharing options... Followers 0. Reply to this topic; Start new topic; Recommended Posts. Sami. Posted August 17, 2006. Sami. Regular Member; 3 Lexus Model: RX300 ...Nov 09, 2017 · Positive numbers mean the ECU is adding extra fuel. The numbers seem counterintuitive to your Bank1 lean code. Actually they're right in line with the lean code: it's running lean, so the ECU is adding more fuel to compensate. OP, as suggested use carb cleaner or propane, etc. to see if you can find a vacuum leak. 2,122 Posts. Discussion Starter · #1 · Sep 13, 2016. so I've been battling a p0171 (lean bank one) code and I'm running out of ideas. I've replaced, the MAF sensor, bank one's A/F sensor, redid the IMS's gasket (might have stripped a bolt hole while) replaced the PCV, checked all the intake hoses, and still have the code. maybe the camshaft ...Dec 28, 2010 · 11 Posts. #13 · Apr 6, 2021. gdog26 said: Hello, I've the following code at the moment P0171 System too lean BANK 1. 2006 GMC Canyon 3.5L 4x4 automatic. 2 weeks ago I did the following because I had this code P0449 (which is now fixed, the EVAP solenoid valve has been replaced with a new one) The following was done (in order) 1) replaced the ... Mar 15, 2018 · Fast forward to this January, I was driving home from work when the check engine light came on. Using my tool, I saw that it was a P0171-00 "System too lean (bank 1)". I opened the hood and looked around, but didn't see anything amiss, reset the code and went in and researched (I sometimes get random suspension codes too, so didn't know if this ... The Subaru Diagnostics for P0171 (Lean) and P0172 (Rich) are the same.. Would seem that filling the tank is causing some sort of problem with the fuel pressure. You don't mention a change of fuel filter (although may not be due at that service interval). Could be a failing pump.Asked by hammerdal68 Apr 13, 2017 at 03:25 PM about the 2010 Vauxhall Corsa 1.4 SXi (a/c) 5d. Question type: Maintenance & repair. Hi, I recently had the Engine Management Light come on & when I put the code tester on It code P0171 came up showing ' System Too Lean ' BANK 1. So, apart from putting an additive In which was a fuel system cleaner ... It has long tube headers (with cats), KNN cold air induction and Hurst short throw shifter. Since purchase I have replaced the clutch, radiator, starter and the crankcase position sensor. Now, I have this P0171 bank 1 lean code. Actions taken so far: Cleaned KNN filter, tightened up all couplings and pipes. Cleansed MAF sensor.jserrano. Check the fuel system pressure with the fuel pressure regulator vacumm hose connected and disconnected. The way I understand this diagnostic works is that the O2 sensor is receiving a lean reading and when the ECU tries changing the injector pulse the O2 continues to read a lean mixture. Reset the ECU and see if it comes back.Apr 12, 2012 · The O2 sensor you're looking for is in the exhaust manifold, firewall side of the engine. I second Greenman's thoughts on throwing an O2 sensor at it unless you've already ruled out a cracked exhaust manifold and unmetered air leaks. You can try cleaning the MAF, doesn't hurt I suppose. Had a P0171 code and fixed it quickly and cheaply with a new fuel pressure sensor part # EJ7Z-9F972-A. Before replacing I cleared the code two times prior and it came back again, same code. Bank 1 means cylinder 1, so I figured it must be a bad sensor. I did not want to go ripping out MAF and 02 sensors chasing ghosts. Feb 26, 2004 · P0171 is a generic OBD2 trouble code indicating the car is running lean. On a V-6 or V-8, bank 1 is the drivers side or the front group of cylinders depending on if the engine is inline mounted like a Crown Vic or transverse mounted like the third generation Altimas. P0174 indicates the other side group of cylinders. The P0171 code means that more air than gasoline is detected in the exhaust gases exiting the combustion chamber. If the P0171 is set in along with the P0174 code, it is highly likely that the problem is caused by an intake leak. If there are no intake leaks, the next step is to replace the air filter and clean the Mass Air Flow (MAF) Sensor. System Too Lean What does this mean? OBD2 Code P0171 Volvo definition: Basically this means that an oxygen sensor in bank 1 detected a lean condition (too much oxygen in the exhaust). On V6/V8/V10 engines, Bank 1 is the side of the engine that has cylinder #1.P0171 is a generic OBD-II diagnostic trouble code (DTC) defined as P0171 System too lean Bank 1. It’s a trouble code that your vehicle’s Powertrain Control Module (PCM) or Engine Control Module (ECM) logs and alerts via Check Engine Light when it detects a lean fuel mixture on Bank 1 of a V-type engine. A P0171 code indicating a lean ... P0171 Front Bank Lean. Codes P0171 Lean Bank One. P0171 - System Too Lean (Bank 1) Im not saying that it will 100% for sure answer your questions, but at least then you will have a better understanding of what is going and the things that people recommend and why. 97 GTP Sold-prolly rusted away by now.Sep 3, 2006. #1. I drive a 2003 Discovery with 73,000 miles. I keep getting a P0171 (bank 1 lean) code that I cannot get resolved. The closest dealership is 120 miles away. Every time I take it there they charge me 100$ an hour labor stating the problem is fixed yet my service engine light is back on 40 miles later with the same code.P0171 Code: System Too Lean (Bank 1) - In The Garage with CarParts.com. GET $30 OFF EVERYTHING. x. 1/6. GET $30 OFF EVERYTHING. For Each Friend You Refer to CarParts.com. 2/6. 19 New and Upcoming EVs We're Most Excited For. Get FREE Auto Repair Tips + 10% OFF on CarParts.com.I'm getting P0171 and P0174 codes on my 2000 MR2 Spyder. P0171 is System Bank 1 Lean, P0174 is System Bank 2 lean. If I'm getting both of these codes at the same time, could it mean I have some type of a vaccum leak? I have also read on other forums that there was a recall for the fuel injectors in some of the 2000 Toyotas.The shorter-term for the system is too lean in bank 1 is code P0171. This code means that the system is running weakly on the first engine bank and is unable to properly deliver the correct amount of fuel to power the engine.Sep 06, 2008 · CEL P0171 Lean Bank 1. Thread starter bigdog225; Start date Sep 6, 2008; Sep 6, 2008 #1 bigdog225. Probationary Member. 19 0 Apr 18, 2008 Houston, Texas. 99 Eclipse ... This lean mixture can either be short term or long term. If the lean mixture is a short term one, it means that the fuel mixture is usually very lean. Otherwise, for long-term lean mixture, the code p0171 is registered according to an indication of the lean mixture through time. By design, these O2 sensors typically come with a +/- 15% range.P0171 is a diagnostic trouble code (DTC) for "System Too Lean (Bank 1)". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic for $114.99 .Lexus 2000 Rx300 P0171 System Too Lean Bank 1 Lexus 2000 Rx300 P0171 System Too Lean Bank 1. By Sami, August 17, 2006 in 99 - 03 Lexus RX300. Share More sharing options... Followers 0. Reply to this topic; Start new topic; Recommended Posts. Sami. Posted August 17, 2006. Sami. Regular Member; 3 Lexus Model: RX300 ...P0171 - System to Lean (Bank 1) The Adaptive Fuel Strategy continuously monitors fuel delivery hardware. The test fails when the adaptive fuel tables reach a rich calibrated limit. For lean and rich DTCs: Fuel system. Excessive fuel pressure. Leaking/contaminated fuel injectors. Leaking fuel pressure regulator.May 25, 2022 · What does code P0171 mean? “Code P0171 – system too lean bank 1” means there is too much oxygen or too little fuel in the exhaust, which is referred to as a “lean” condition, or a lean or “low fuel trim” code. This can be caused by something like a disconnected hose or vacuum leak, which means there’s more air than usual, or ... Sep 06, 2008 · CEL P0171 Lean Bank 1. Thread starter bigdog225; Start date Sep 6, 2008; Sep 6, 2008 #1 bigdog225. Probationary Member. 19 0 Apr 18, 2008 Houston, Texas. 99 Eclipse ... Dec 27, 2010 · The code indicates lean fuel at O2 sensors but is attributed to a vacuum leak. Mine was at the back of the Vacuum Brake booster. Try blowing smoke into vacuum system on engine off and look for exit points. Or spraying a bit of propane near the suspected leak to see if engine speed changes while running the engine. Oct 25, 2016 · 22,508 Posts. #2 · Oct 25, 2016. The downstream 02 sensors you replaced don't do anything for that code (P0171). The downstream are only being looked at to gauge the catalytic converter efficiency. It's the UPstream o2 sensors that monitor lean/rich conditions. The passenger side upstream o2 sensor would be the suspect in this case. Dec 27, 2016 · A P0171 code usually is triggered by one or more of the following: * cracked or split vacuum line or PCV hose. * faulty PCV valve. * faulty MAP sensor. * exhaust leak forward of the first O2 sensor. Typically this is caused by a cracked intake manifold gasket on an exhaust port. In some cases (but not normally) it can also indicate a faulty O2 ... On V6/V8/V10 engines, Bank 1 is the side of the engine that has cylinder #1. The P0171 is one of the more common trouble codes. This code is triggered by the first downstream (front) O2 sensor. The sensor provides a reading of the air:fuel ratio leaving the engine’s cylinders, and the vehicles powertrain/engine control module (PCM/ECM) uses ... May 11, 2010 · dero. Registered. Joined Aug 19, 2008. 607 Posts. #6 · May 11, 2010. Disconnect the battery and flip the headlight switch on and wait maybe 15 minutes. I personally would go back to a dry element filter. It's impossible to mess up the MAF sensor with one of those. C. 11 Posts. #13 · Apr 6, 2021. gdog26 said: Hello, I've the following code at the moment P0171 System too lean BANK 1. 2006 GMC Canyon 3.5L 4x4 automatic. 2 weeks ago I did the following because I had this code P0449 (which is now fixed, the EVAP solenoid valve has been replaced with a new one) The following was done (in order) 1) replaced the ...Nov 06, 2005 · I got check light on in my 00 RX300 (currently only 21000 miles) and ran a computer scan at Auto Zone today. The error code is P0171..System too lean (Bank 1). Had a P0171 code and fixed it quickly and cheaply with a new fuel pressure sensor part # EJ7Z-9F972-A. Before replacing I cleared the code two times prior and it came back again, same code. Bank 1 means cylinder 1, so I figured it must be a bad sensor. I did not want to go ripping out MAF and 02 sensors chasing ghosts. Nov 09, 2017 · Positive numbers mean the ECU is adding extra fuel. The numbers seem counterintuitive to your Bank1 lean code. Actually they're right in line with the lean code: it's running lean, so the ECU is adding more fuel to compensate. OP, as suggested use carb cleaner or propane, etc. to see if you can find a vacuum leak. Discussion Starter · #1 · May 6, 2012. Only show this user. Ok , I got the P0171 - System to Lean (Bank 1) code today , scanned it with my scanner , then erased it , drove a little more and it came on one more time.Erased it again and nothing has come back yet.I did the normal checks for vacuum leaks , have none , had a small exhaust leak ... P0171 - System to lean bank 1 -permanent P2196 - o2 sensor biased/stuck rich bank 1 sensor 1 Hello and thanks for reading and the help. I picked up this car for my son to drive for college it's a 2013 Subaru Crosstrek used 101,250 miles. It appeared to not have the 100k maintenance done. So...Joined Jun 4, 2015. 1,715 Posts. Discussion Starter · #1 · Dec 5, 2016. So while cruising on the highway tonight, popped a P0171 code, system too lean bank 1. Seeing that light come on scared the crap out of me, since I'm running E85 on the Throttle Happy tune. However, at this point, I am doubtful it is the tune to blame.Troubleshooting P0171 And P0174 (Ford 4.6L, 5.4L) This article will help you to diagnose diagnostic trouble code P0171 (System Too Lean Bank 1) and/or P0174 (System Too Lean Bank 2) on your Ford, Mercury or Lincoln 4.6L or 5.4L equipped car, pick up, van or SUV. Although you can apply this info to any Ford vehicle with a V6 or V8, this info ...Maintenance Shop - P0171 (Bank 1 lean), P0175 (Bank 2 rich) at sametime - Original problem was running rough and no power with codes P0301, P0306, P0305 & P0306. I changed out the ignition coil, and all plugs, verified wires good. Little to no change, still runs rough. I can pull a plug wire off cylinders 1 through 3...Oct 20, 2021 · NOTE: Although code P0171 – “System too lean – Bank 1” refers to an air/fuel metering issue on Bank 1 of V-type engines, this code also applies to in-line engines that have only one “bank” of cylinders. Therefore, the “Bank 1” part of the definition can be ignored if code P0171 is present on a vehicle with an in-line engine. FORD CODE P0171 SYSTEM TOO LEAN BANK 1. EASY FIXIf you have Ford, your engine light is on and you have code P0171 in this video we will explain what often ca...Oct 25, 2016 · 22,508 Posts. #2 · Oct 25, 2016. The downstream 02 sensors you replaced don't do anything for that code (P0171). The downstream are only being looked at to gauge the catalytic converter efficiency. It's the UPstream o2 sensors that monitor lean/rich conditions. The passenger side upstream o2 sensor would be the suspect in this case. P0171 - System to Lean (Bank 1) The Adaptive Fuel Strategy continuously monitors fuel delivery hardware. The test fails when the adaptive fuel tables reach a rich calibrated limit. For lean and rich DTCs: Fuel system. Excessive fuel pressure. Leaking/contaminated fuel injectors. Leaking fuel pressure regulator.P0171 is a generic OBD-II diagnostic trouble code (DTC) defined as P0171 System too lean Bank 1. It’s a trouble code that your vehicle’s Powertrain Control Module (PCM) or Engine Control Module (ECM) logs and alerts via Check Engine Light when it detects a lean fuel mixture on Bank 1 of a V-type engine. A P0171 code indicating a lean ... Sep 28, 2018 · There are lots of things that can cause a P0171 lean condition code. It means that the computer is adding fuel to compensate for a lean condition that it sees. It's important to know your vehicle, though, too. The gen 2 Odys only have one bank for emissions reporting purposes since there is only one set of O2 sensors. Apr 16, 2014 · Needless to say my heart sank. I read the DTC code with my SCT tuner, and it read "P0171- System to Lean Bank 1". After talking with my tuner at Tasca, he indicated this code can mean multiple things, but usually indicates an air or vacuum leak. This was bacfked up with information posted on this and other forums. Aug 12, 2013 · Blackbalts. Possible that your o2 sensor is just bad and is reading lean which is forcing the engine to run rich as faq. Get the pump replaced first, then possibly look into replacing the o2 sensor (OEM only). Shouldn't be an issue with your injectors, but you could run some cleaner through to possibly rule that out. What does code P0171 mean? "Code P0171 - system too lean bank 1" means there is too much oxygen or too little fuel in the exhaust, which is referred to as a "lean" condition, or a lean or "low fuel trim" code. This can be caused by something like a disconnected hose or vacuum leak, which means there's more air than usual, or ...System Too Lean What does this mean? OBD2 Code P0171 Volvo definition: Basically this means that an oxygen sensor in bank 1 detected a lean condition (too much oxygen in the exhaust). On V6/V8/V10 engines, Bank 1 is the side of the engine that has cylinder #1.Nov 09, 2017 · Positive numbers mean the ECU is adding extra fuel. The numbers seem counterintuitive to your Bank1 lean code. Actually they're right in line with the lean code: it's running lean, so the ECU is adding more fuel to compensate. OP, as suggested use carb cleaner or propane, etc. to see if you can find a vacuum leak. P0171 System too Lean (Bank 1) ) faulty air mass flow sensor: P0172 System too Rich (Bank 1) ). . virtuallyghetto usb nic craigslist allentown. OBD2 Code P0171 Mercedes definition: Basically this means that an oxygen sensor in bank 1 detected a lean condition (too much oxygen in the exhaust). On V6/V8/V10 engines, Bank 1 is the side of the ...P0171 - System Too Lean (Bank 1) P0174 - System Too Lean (Bank 2) Basically this means that an oxygen sensor in bank 1 detected a lean condition (too much oxygen in the exhaust). On V6/V8/V10 engines, Bank 1 is the side of the engine that has cylinder #1. Note: This DTC is very similar to P0174, and in fact your vehicle may show both codes at ...Fast forward to this January, I was driving home from work when the check engine light came on. Using my tool, I saw that it was a P0171-00 "System too lean (bank 1)". I opened the hood and looked around, but didn't see anything amiss, reset the code and went in and researched (I sometimes get random suspension codes too, so didn't know if this ...Check Light On...p0171 System Too Lean (bank 1) Check Light On...p0171 System Too Lean (bank 1) By kthan, November 6, 2005 in 99 - 03 Lexus RX300. Share More sharing options... Followers 0. Reply to this topic; Start new topic; Recommended Posts. kthan. Posted November 6, 2005. kthan. Regular Member; 6 Lexus Model: RX300 ...Feb 26, 2004 · P0171 is a generic OBD2 trouble code indicating the car is running lean. On a V-6 or V-8, bank 1 is the drivers side or the front group of cylinders depending on if the engine is inline mounted like a Crown Vic or transverse mounted like the third generation Altimas. P0174 indicates the other side group of cylinders. P0171 is a diagnostic trouble code (DTC) for "System Too Lean (Bank 1)". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic for $114.99 . This article will therefore deal with code P0171 as it applies specifically to GM vehicles. OBD II fault code P0171 is a generic trouble code that is defined as "System too lean - Bank 1" and is set when the PCM (Powertrain Control Module) detects an air/fuel mixture that is too lean on bank 1.Sep 28, 2018 · There are lots of things that can cause a P0171 lean condition code. It means that the computer is adding fuel to compensate for a lean condition that it sees. It's important to know your vehicle, though, too. The gen 2 Odys only have one bank for emissions reporting purposes since there is only one set of O2 sensors. The P0171 is based on a reading of the one A/F Sensor which is after both bank's exhausts have been merged. An exhaust leak anywhere ahead of the sensor can introduce excess oxygen which is interpreted as insufficient fuel (i.e., lean A/F mix), but also a leak anywhere on the intake side can have the same effect. T.See full list on obd-codes.com P0171 is a generic OBD2 trouble code indicating the car is running lean. On a V-6 or V-8, bank 1 is the drivers side or the front group of cylinders depending on if the engine is inline mounted like a Crown Vic or transverse mounted like the third generation Altimas. P0174 indicates the other side group of cylinders.Feb 21, 2022 · Combustion engines run most efficiently when they maintain an air-fuel mixture ratio of 14.7 parts air to 1 part fuel. Too much fuel and/or too little air results in the engine running rich setting a P0172 trouble code, while too little fuel and/or too much air results in the engine running lean resulting in a check engine light for the P0171 code. Feb 02, 2020 · P0171 Front Bank Lean. Codes P0171 Lean Bank One. P0171 - System Too Lean (Bank 1) Im not saying that it will 100% for sure answer your questions, but at least then you will have a better understanding of what is going and the things that people recommend and why. 97 GTP Sold-prolly rusted away by now. P0171 - System Too Lean (Bank 1) P0174 - System Too Lean (Bank 2) Basically this means that an oxygen sensor in bank 1 detected a lean condition (too much oxygen in the exhaust). On V6/V8/V10 engines, Bank 1 is the side of the engine that has cylinder #1. Note: This DTC is very similar to P0174, and in fact your vehicle may show both codes at ...P0171 is a generic OBD-II diagnostic trouble code (DTC) defined as P0171 System too lean Bank 1. It’s a trouble code that your vehicle’s Powertrain Control Module (PCM) or Engine Control Module (ECM) logs and alerts via Check Engine Light when it detects a lean fuel mixture on Bank 1 of a V-type engine. A P0171 code indicating a lean ... Check Light On...p0171 System Too Lean (bank 1) Check Light On...p0171 System Too Lean (bank 1) By kthan, November 6, 2005 in 99 - 03 Lexus RX300. Share More sharing options... Followers 0. Reply to this topic; Start new topic; Recommended Posts. kthan. Posted November 6, 2005. kthan. Regular Member; 6 Lexus Model: RX300 ...Nov 09, 2017 · Positive numbers mean the ECU is adding extra fuel. The numbers seem counterintuitive to your Bank1 lean code. Actually they're right in line with the lean code: it's running lean, so the ECU is adding more fuel to compensate. OP, as suggested use carb cleaner or propane, etc. to see if you can find a vacuum leak. Dec 27, 2016 · A P0171 code usually is triggered by one or more of the following: * cracked or split vacuum line or PCV hose. * faulty PCV valve. * faulty MAP sensor. * exhaust leak forward of the first O2 sensor. Typically this is caused by a cracked intake manifold gasket on an exhaust port. In some cases (but not normally) it can also indicate a faulty O2 ... Jan 12, 2010 · P0171 - System to Lean (Bank 1) The Adaptive Fuel Strategy continuously monitors fuel delivery hardware. The test fails when the adaptive fuel tables reach a rich calibrated limit. For lean and rich DTCs: Fuel system. Excessive fuel pressure. Leaking/contaminated fuel injectors. Leaking fuel pressure regulator. May 11, 2010 · dero. Registered. Joined Aug 19, 2008. 607 Posts. #6 · May 11, 2010. Disconnect the battery and flip the headlight switch on and wait maybe 15 minutes. I personally would go back to a dry element filter. It's impossible to mess up the MAF sensor with one of those. C. P0171 - System Too Lean (Bank 1) P0174 - System Too Lean (Bank 2) Basically this means that an oxygen sensor in bank 1 detected a lean condition (too much oxygen in the exhaust). On V6/V8/V10 engines, Bank 1 is the side of the engine that has cylinder #1. Note: This DTC is very similar to P0174, and in fact your vehicle may show both codes at ...It has long tube headers (with cats), KNN cold air induction and Hurst short throw shifter. Since purchase I have replaced the clutch, radiator, starter and the crankcase position sensor. Now, I have this P0171 bank 1 lean code. Actions taken so far: Cleaned KNN filter, tightened up all couplings and pipes. Cleansed MAF sensor.Oct 20, 2021 · NOTE: Although code P0171 – “System too lean – Bank 1” refers to an air/fuel metering issue on Bank 1 of V-type engines, this code also applies to in-line engines that have only one “bank” of cylinders. Therefore, the “Bank 1” part of the definition can be ignored if code P0171 is present on a vehicle with an in-line engine. Dec 27, 2010 · The code indicates lean fuel at O2 sensors but is attributed to a vacuum leak. Mine was at the back of the Vacuum Brake booster. Try blowing smoke into vacuum system on engine off and look for exit points. Or spraying a bit of propane near the suspected leak to see if engine speed changes while running the engine. Apr 12, 2017 · P0171 is triggered at 1.29 Lambda, so you should log your LTFT+STFT and make sure they are as close to zero as possible, ideally you want to be +/-2% at all times. Some fluctuation during decel is normal, but while driving you should be pretty close to zero. Oct 20, 2021 · NOTE: Although code P0171 – “System too lean – Bank 1” refers to an air/fuel metering issue on Bank 1 of V-type engines, this code also applies to in-line engines that have only one “bank” of cylinders. Therefore, the “Bank 1” part of the definition can be ignored if code P0171 is present on a vehicle with an in-line engine. Dec 27, 2016 · A P0171 code usually is triggered by one or more of the following: * cracked or split vacuum line or PCV hose. * faulty PCV valve. * faulty MAP sensor. * exhaust leak forward of the first O2 sensor. Typically this is caused by a cracked intake manifold gasket on an exhaust port. In some cases (but not normally) it can also indicate a faulty O2 ... Positive numbers mean the ECU is adding extra fuel. The numbers seem counterintuitive to your Bank1 lean code. Actually they're right in line with the lean code: it's running lean, so the ECU is adding more fuel to compensate. OP, as suggested use carb cleaner or propane, etc. to see if you can find a vacuum leak.May 25, 2022 · What does code P0171 mean? “Code P0171 – system too lean bank 1” means there is too much oxygen or too little fuel in the exhaust, which is referred to as a “lean” condition, or a lean or “low fuel trim” code. This can be caused by something like a disconnected hose or vacuum leak, which means there’s more air than usual, or ... Jul 20, 2022 · If the P0171 is combined with the P0174 code, it's very likely that the problem is caused by an intake leak. If there are no intake leaks, the next step is to replace the air filter and clean the air flow meter. If the problem persists the front oxygen (O2) sensor may need to be replaced. Dec 27, 2010 · The code indicates lean fuel at O2 sensors but is attributed to a vacuum leak. Mine was at the back of the Vacuum Brake booster. Try blowing smoke into vacuum system on engine off and look for exit points. Or spraying a bit of propane near the suspected leak to see if engine speed changes while running the engine. May 25, 2022 · What does code P0171 mean? “Code P0171 – system too lean bank 1” means there is too much oxygen or too little fuel in the exhaust, which is referred to as a “lean” condition, or a lean or “low fuel trim” code. This can be caused by something like a disconnected hose or vacuum leak, which means there’s more air than usual, or ... P0171 too lean bank one. Discussion in '1st Gen. Tacomas (1995-2004)' started by Danberry2242, Jul 3, 2017. Post Reply. Page 1 of 3 1 2 3 Next > Jul 3, 2017 at 6:12 PM #1 #1. ... too lean is most likely maf sensor or o2 sensors. allthough maf sensors usually pop a maf code. looks like stealership diag is in order. daryl lict, Jul 6, 2017 #3.Oct 03, 2008 · The Subaru Diagnostics for P0171 (Lean) and P0172 (Rich) are the same.. Would seem that filling the tank is causing some sort of problem with the fuel pressure. You don't mention a change of fuel filter (although may not be due at that service interval). Could be a failing pump. P0171 is a generic OBD2 trouble code indicating the car is running lean. On a V-6 or V-8, bank 1 is the drivers side or the front group of cylinders depending on if the engine is inline mounted like a Crown Vic or transverse mounted like the third generation Altimas. P0174 indicates the other side group of cylinders.The P0171 error code's main definition is "System Too Lean (Bank 1)." To better understand this definition, it is crucial for you to go through the basics that involve when your fuel is lean versus when it's too rich. We will cover this basic in the following section to help you determine whether the P0171 error code is serious or not.Basically this means that an oxygen sensor in bank 1 has detected a lean condition (too much oxygen in the exhaust). On V6/V8/V10 engines, Bank 1 is the side of the engine that has cylinder #1. The P0171 is one of the more common trouble codes. This code is triggered by the first downstream (front) O2 sensor.May 25, 2021 · The P0171 error code's main definition is “System Too Lean (Bank 1).” To better understand this definition, it is crucial for you to go through the basics that involve when your fuel is lean versus when it's too rich. We will cover this basic in the following section to help you determine whether the P0171 error code is serious or not. May 25, 2021 · The P0171 error code's main definition is “System Too Lean (Bank 1).” To better understand this definition, it is crucial for you to go through the basics that involve when your fuel is lean versus when it's too rich. We will cover this basic in the following section to help you determine whether the P0171 error code is serious or not. P0171 is a generic OBD2 trouble code indicating the car is running lean. On a V-6 or V-8, bank 1 is the drivers side or the front group of cylinders depending on if the engine is inline mounted like a Crown Vic or transverse mounted like the third generation Altimas. P0174 indicates the other side group of cylinders.P0171 is a diagnostic trouble code (DTC) for "System Too Lean (Bank 1)". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic for $114.99 . Apr 16, 2014 · Needless to say my heart sank. I read the DTC code with my SCT tuner, and it read "P0171- System to Lean Bank 1". After talking with my tuner at Tasca, he indicated this code can mean multiple things, but usually indicates an air or vacuum leak. This was bacfked up with information posted on this and other forums. P0171 is an OBDII trouble code. The code technically stands for: Fuel Trim System Lean Bank 1. The code is thrown when the oxygen sensors detect that there's not enough oxygen in the exhaust system. This is commonly referred to as a "lean" condition. The vehicles ECM will add more fuel to the mixture in order to bring the air fuel mixture ...A P0171 lean code for bank 1 is the cylinder bank on the RIGHT (passenger) side of the engine on Ford vehicles with a V6 or V8 engine and rear-wheel drive. A lean fuel condition may exist if the engine is sucking in too much air and/or the fuel system is not delivering enough fuel. If bad enough, a lean fuel condition may cause lean misfire, a ...Jan 27, 2021 · OBD II fault code P0171 is a generic trouble code that is defined as “System too lean – Bank 1” and is set when the PCM (Powertrain Control Module) detects an air/fuel mixture that is too lean on bank 1. Note that in the context of this code, “system” refers to faults in the air/fuel metering system that cause, or contribute to an ... This is one of the most common trouble codes in V-6 and larger engines. P0171 is a "System Too Lean (Bank 1)," which is triggered by the first exhaust oxygen (02) sensor (aka upstream 02 sensor) on the "Bank 1" side of the engine (designated as whichever side has cylinder number one). The Air-To-Fuel Mix Mar 16, 2011 · P0171 - System to Lean (Bank 1) The Adaptive Fuel Strategy continuously monitors fuel delivery hardware. The test fails when the adaptive fuel tables reach a rich calibrated limit. For lean and rich DTCs: Fuel system. Excessive fuel pressure. Leaking/contaminated fuel injectors. Leaking fuel pressure regulator. Joined Jun 4, 2015. 1,715 Posts. Discussion Starter · #1 · Dec 5, 2016. So while cruising on the highway tonight, popped a P0171 code, system too lean bank 1. Seeing that light come on scared the crap out of me, since I'm running E85 on the Throttle Happy tune. However, at this point, I am doubtful it is the tune to blame.May 25, 2021 · The P0171 error code's main definition is “System Too Lean (Bank 1).” To better understand this definition, it is crucial for you to go through the basics that involve when your fuel is lean versus when it's too rich. We will cover this basic in the following section to help you determine whether the P0171 error code is serious or not. P0171-Powertrain System too Lean (Bank 1) Parvaiz Iqbal, Sep 3, 2019, in forum: Gen 2 Prius Technical Discussion. Replies: 1 Views: 2,759. SFO Sep 3, 2019. P0171 code and fuel gauge went from half to 1 blinking bar instantly. Shavisno, Jul 13, 2019, in forum: Gen 2 Prius Technical Discussion. Replies: 2 Views:Check Light On...p0171 System Too Lean (bank 1) Check Light On...p0171 System Too Lean (bank 1) By kthan, November 6, 2005 in 99 - 03 Lexus RX300. Share More sharing options... Followers 0. Reply to this topic; Start new topic; Recommended Posts. kthan. Posted November 6, 2005. kthan. Regular Member; 6 Lexus Model: RX300 ...What Does Code P0171 Mean for Your Honda? P0171 definition: Bank 1 has too much air or not enough fuel; Issue Severity: MODERATE- Extended driving with this code can cause internal engine damage. Repair Urgency: Get this code fixed as soon as possible to avoid damage to spark plugs, pistons, and catalytic converters. Diagnosis: It is important to complete the entire diagnostic process when ...P0171 - System to lean bank 1 -permanent P2196 - o2 sensor biased/stuck rich bank 1 sensor 1 Hello and thanks for reading and the help. I picked up this car for my son to drive for college it's a 2013 Subaru Crosstrek used 101,250 miles. It appeared to not have the 100k maintenance done. So...P0171 (lean fuel injection system, Bank 1) simply means the air-fuel ratio is too lean that the ECM can no longer compensate due to very large error. It can be caused by air intake/exhaust leak, defective front O2 sensor, bad fuel injectors, low fuel pressure or even a dirty/faulty MAF sensor.May 11, 2010 · dero. Registered. Joined Aug 19, 2008. 607 Posts. #6 · May 11, 2010. Disconnect the battery and flip the headlight switch on and wait maybe 15 minutes. I personally would go back to a dry element filter. It's impossible to mess up the MAF sensor with one of those. C. Jan 07, 2021 · It has long tube headers (with cats), KNN cold air induction and Hurst short throw shifter. Since purchase I have replaced the clutch, radiator, starter and the crankcase position sensor. Now, I have this P0171 bank 1 lean code. Actions taken so far: Cleaned KNN filter, tightened up all couplings and pipes. Cleansed MAF sensor. I'm getting P0171 and P0174 codes on my 2000 MR2 Spyder. P0171 is System Bank 1 Lean, P0174 is System Bank 2 lean. If I'm getting both of these codes at the same time, could it mean I have some type of a vaccum leak? I have also read on other forums that there was a recall for the fuel injectors in some of the 2000 Toyotas.System Too Lean What does this mean? OBD2 Code P0171 Volvo definition: Basically this means that an oxygen sensor in bank 1 detected a lean condition (too much oxygen in the exhaust). On V6/V8/V10 engines, Bank 1 is the side of the engine that has cylinder #1.Aug 18, 2014 · I get home and pull the code and I get a P0171 - System Bank 1 Too Lean. So I do a little searching and find some of these possible causes: 1) Fuel Filter clogged - Don't have one (sock in tank) 2) MAF Dirty - Don't have one (have a MAP, but not a MAF) 3) Bad Front heated O2 sensor - Never replaced them, but don't these have their own code? On V6/V8/V10 engines, Bank 1 is the side of the engine that has cylinder #1. The P0171 is one of the more common trouble codes. This code is triggered by the first downstream (front) O2 sensor. The sensor provides a reading of the air:fuel ratio leaving the engine’s cylinders, and the vehicles powertrain/engine control module (PCM/ECM) uses ... 2,122 Posts. Discussion Starter · #1 · Sep 13, 2016. so I've been battling a p0171 (lean bank one) code and I'm running out of ideas. I've replaced, the MAF sensor, bank one's A/F sensor, redid the IMS's gasket (might have stripped a bolt hole while) replaced the PCV, checked all the intake hoses, and still have the code. maybe the camshaft ...Maintenance Shop - P0171 (Bank 1 lean), P0175 (Bank 2 rich) at sametime - Original problem was running rough and no power with codes P0301, P0306, P0305 & P0306. I changed out the ignition coil, and all plugs, verified wires good. Little to no change, still runs rough. I can pull a plug wire off cylinders 1 through 3...Maintenance Shop - P0171 (Bank 1 lean), P0175 (Bank 2 rich) at sametime - Original problem was running rough and no power with codes P0301, P0306, P0305 & P0306. I changed out the ignition coil, and all plugs, verified wires good. Little to no change, still runs rough. I can pull a plug wire off cylinders 1 through 3...May 25, 2022 · What does code P0171 mean? “Code P0171 – system too lean bank 1” means there is too much oxygen or too little fuel in the exhaust, which is referred to as a “lean” condition, or a lean or “low fuel trim” code. This can be caused by something like a disconnected hose or vacuum leak, which means there’s more air than usual, or ... P0171 is a generic OBD-II diagnostic trouble code (DTC) defined as P0171 System too lean Bank 1. It’s a trouble code that your vehicle’s Powertrain Control Module (PCM) or Engine Control Module (ECM) logs and alerts via Check Engine Light when it detects a lean fuel mixture on Bank 1 of a V-type engine. A P0171 code indicating a lean ... Jan 07, 2021 · It has long tube headers (with cats), KNN cold air induction and Hurst short throw shifter. Since purchase I have replaced the clutch, radiator, starter and the crankcase position sensor. Now, I have this P0171 bank 1 lean code. Actions taken so far: Cleaned KNN filter, tightened up all couplings and pipes. Cleansed MAF sensor. P0171-Powertrain System too Lean (Bank 1) Parvaiz Iqbal, Sep 3, 2019, in forum: Gen 2 Prius Technical Discussion. Replies: 1 Views: 2,759. SFO Sep 3, 2019. P0171 code and fuel gauge went from half to 1 blinking bar instantly. Shavisno, Jul 13, 2019, in forum: Gen 2 Prius Technical Discussion. Replies: 2 Views:P0171 Fuel system indicates lean Too Lean (Bank 1) System: PCM/Emissions/fuel system According to the Manufacture, here are the possible causes for this code. Vehicle driven low on fuel or until it ran out of fuel Air/vacuum leaks HO2S or Air fuel ratio sensor Fuel injectors, dirty or pressure regulator has failedMay 11, 2010 · dero. Registered. Joined Aug 19, 2008. 607 Posts. #6 · May 11, 2010. Disconnect the battery and flip the headlight switch on and wait maybe 15 minutes. I personally would go back to a dry element filter. It's impossible to mess up the MAF sensor with one of those. C. The P0171 is based on a reading of the one A/F Sensor which is after both bank's exhausts have been merged. An exhaust leak anywhere ahead of the sensor can introduce excess oxygen which is interpreted as insufficient fuel (i.e., lean A/F mix), but also a leak anywhere on the intake side can have the same effect. T.The P0171 code means that more air than gasoline is detected in the exhaust gases exiting the combustion chamber. If the P0171 is set in along with the P0174 code, it is highly likely that the problem is caused by an intake leak. If there are no intake leaks, the next step is to replace the air filter and clean the Mass Air Flow (MAF) Sensor. Jan 12, 2010 · P0171 - System to Lean (Bank 1) The Adaptive Fuel Strategy continuously monitors fuel delivery hardware. The test fails when the adaptive fuel tables reach a rich calibrated limit. For lean and rich DTCs: Fuel system. Excessive fuel pressure. Leaking/contaminated fuel injectors. Leaking fuel pressure regulator. Tech description. If the P0171 BMW is combined with the P0174 BMW code, it’s very likely that the problem is caused by an intake leak. If there are no intake leaks, the next step is to replaced the air filter and clean the air flow meter. If the problem persist the front oxygen (O2) sensor may need to be replaced. 2006 Trailblazer P0171 BMW. Had a P0171 code and fixed it quickly and cheaply with a new fuel pressure sensor part # EJ7Z-9F972-A. Before replacing I cleared the code two times prior and it came back again, same code. Bank 1 means cylinder 1, so I figured it must be a bad sensor. I did not want to go ripping out MAF and 02 sensors chasing ghosts. Had a P0171 code and fixed it quickly and cheaply with a new fuel pressure sensor part # EJ7Z-9F972-A. Before replacing I cleared the code two times prior and it came back again, same code. Bank 1 means cylinder 1, so I figured it must be a bad sensor. I did not want to go ripping out MAF and 02 sensors chasing ghosts. May 11, 2010 · dero. Registered. Joined Aug 19, 2008. 607 Posts. #6 · May 11, 2010. Disconnect the battery and flip the headlight switch on and wait maybe 15 minutes. I personally would go back to a dry element filter. It's impossible to mess up the MAF sensor with one of those. C. P0171 is a "System Too Lean (Bank 1)," which is triggered by the first exhaust oxygen (02) sensor (aka upstream 02 sensor) on the "Bank 1" side of the engine (designated as whichever side has cylinder number one). The Air-To-Fuel Mix.Oct 10, 2018 · The P0171 code means that, on the first bank of the engine, the fuel system is running weak or a vacuum leak exists near this side of the engine. A lean condition occurs when the engine either receives too little fuel or too much air. By Tony Greene - October 10, 2018. This article applies to the Lexus IS, RX, GS, LS, and ES (2005-Present) Oct 25, 2016 · 22,508 Posts. #2 · Oct 25, 2016. The downstream 02 sensors you replaced don't do anything for that code (P0171). The downstream are only being looked at to gauge the catalytic converter efficiency. It's the UPstream o2 sensors that monitor lean/rich conditions. The passenger side upstream o2 sensor would be the suspect in this case.