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P0171 Diagnostic Trouble Code Discussion for November 2013

Fuel System Lean (Bank 1)


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Trouble Ticket Help Requests for DTC P0171
Help Request Posted
2002 Toyota Celica GT 1.8L Hesitation, Surge, MIL Lamp on VIN: JTDDR32T12
P0171: Fuel System Too Lean (Bank 1). When this car arrived, I thought it would be an easy fix. It had a K&N air filter and a lean code. The live data and freeze data showed everything to be okay, except for the fuel trim. Both short and long fuel trim added up to around 50 percent. I tested f...
November 07, 2013
2005 Ford Five Hundred Limited 3.0L MIL Lamp on VIN: 1FAFP25195
Hello, I need help due to lack of info from Mitchell. this five hundred when you clear codes will drive & shift normal till codes set. then the cel and little wrench light comes on & trans won't shift up or dowm from second. I've read from archives (on...
November 12, 2013
2006 Subaru Outback R VDC Limited 3.0L MIL Lamp on VIN: 4S4BP85CX6
P0171: Fuel System Too Lean (Bank 1). ... Outback with the 3.0 that keeps trowing the check engine light on with the following codes p0171 and p0174 for lean condition on booth banks. we check fuel pressure and found good fuel pressure 45 psi regulated and 50mpsi unregulated. we smoked test engine...
November 18, 2013
2006 Chevrolet Equinox LS 3.4L MIL Lamp on VIN: 2CNDL13F26
P0171: Fuel Trim System Lean (Bank 1). O.k. Here we go. Vehicle cam in overheating/ blown head gasket.remove heads set to machine shop for repairs ,reinstall heads , new bolts and gaskets, torque to yield with new snap on wrench, test drive all is well . Five days later customer calls with check en...
November 19, 2013
2006 GMC Envoy XL SLT 4.2L Poor Idle Quality VIN: 1GKET16S66
P0171: Fuel system lean. We replaced purge solenoid and vent solenoid about a two weeks ago. Customer stated that check engine light came on the next day and would idle erratically and die at lights. She went to put gas in it and it started hard (she said it took five attempts to star...
November 20, 2013
1998 Lexus ES300 3.0L MIL Lamp on VIN: JT8BF28G1W
P0171: Fuel System Too Lean (Bank 1). ... with p0171 and p0420-at that time we replaced fuel filter and cleaned mass air sensor and replaced pcv. did a cat efficiency test with escan which revealed bad cat.so customer took it to exhaust shop and had cat and bank one upstream sensor replaced.p0420 ...
November 20, 2013
2001 Nissan Sentra GXE 1.8L Excessive Emissions, Poor Idle Quality, Hesitation, Misfire VIN: 3N1CB51D01
P0171: Fuel Trim Lean. On accel this car will just fall on it's face and just surge. The engine makes that noise you hear when the engine is starving for fuel like a fuel pump is going bad and when you accel you hear the loud air noise coming from the throttle body. Don't know any o...
November 20, 2013
2005 Volkswagen Jetta GL 2.0L MIL Lamp on VIN: 3VWRK69M25
P0171: testing and results. ... and p0171. Checked the maf and it was dirty as can be so we replaced it and test drove car. Seemed OK so we gave it back to customer. Next day he called and said after 30 minutes of driving the check engine light came bac...
November 21, 2013
1998 Lexus ES300 3.0L MIL Lamp on VIN: JT8BF28G1W
P0171: Fuel System Too Lean (Bank 1). ... with p0171 and p0420-at that time we replaced fuel filter and cleaned mass air sensor and replaced pcv. did a cat efficiency test with escan which revealed bad cat.so customer took it to exhaust shop and had cat and bank one upstream sensor replaced.p0420 ...
November 22, 2013
2000 Ford Explorer XLS 4.0L Poor Idle Quality VIN: 1FMZU62X3Y
P0171: system too lean Bank 1. ... have a down stream 02 sensor that is not reading anything on my scan tool and have p0171 and p0174 system too lean bank 1 and 2. I have replaced down stream 02 sensor, smoked tested for vacuum leaks and none were found. Also I cleaned the MAF sensor and is...
November 25, 2013
2004 Ford F-150 FX4 5.4L Misfire, MIL Lamp on VIN: 1FTPW14514
P0171: Lean Bank 1. ... results are from freeze frame for P0171, Fuel pressure is within spec KOEO and Matches PID for FRPS, test drove MAF reading max was only 180 G/sec, replaced MAF with NAPA reman, MAF reading now maxes out at 200 G/sec, checked fuel trims @ idle now LTFT @ 5...
November 29, 2013
2007 Pontiac G6 2.4L Poor Idle Quality VIN: 1G2ZG58B67
P0171: Fuel System Lean (Bank 1). ... the system p0121,and p0171 i have checked for vaccum leaks and have found none.aftter further investigation on line iwe decided too change the throttle body for these codes after doing so the idle has been stuck over 2300 rpm everytime i start the vehicle....
November 29, 2013
2002 Toyota Celica GT 1.8L Hesitation, Surge, MIL Lamp on VIN: JTDDR32T12
P0171: Fuel System Too Lean (Bank 1). When this car arrived, I thought it would be an easy fix. It had a K&N air filter and a lean code. The live data and freeze data showed everything to be okay, except for the fuel trim. Both short and long fuel trim added up to around 50 percent. I tested f...
November 07, 2013
2005 Ford Five Hundred Limited 3.0L MIL Lamp on VIN: 1FAFP25195
Hello, I need help due to lack of info from Mitchell. this five hundred when you clear codes will drive & shift normal till codes set. then the cel and little wrench light comes on & trans won't shift up or dowm from second. I've read from archives (on...
November 12, 2013
2006 Subaru Outback R VDC Limited 3.0L MIL Lamp on VIN: 4S4BP85CX6
P0171: Fuel System Too Lean (Bank 1). ... trowing the check engine light on with the following codes p0171 and p0174 for lean condition on booth banks. we check fuel pressure and found good fuel pressure 45 psi regulated and 50mpsi unregulated. we smoked test engine...
November 18, 2013
2006 Chevrolet Equinox LS 3.4L MIL Lamp on VIN: 2CNDL13F26
P0171: Fuel Trim System Lean (Bank 1). O.k. Here we go. Vehicle cam in overheating/ blown head gasket.remove heads set to machine shop for repairs ,reinstall heads , new bolts and gaskets, torque to yield with new snap on wrench, test drive all is well . Five days later customer calls with check en...
November 19, 2013
2006 GMC Envoy XL SLT 4.2L Poor Idle Quality VIN: 1GKET16S66
P0171: Fuel system lean. We replaced purge solenoid and vent solenoid about a two weeks ago. Customer stated that check engine light came on the next day and would idle erratically and die at lights. She went to put gas in it and it started hard (she said it took five attempts to star...
November 20, 2013
1998 Lexus ES300 3.0L MIL Lamp on VIN: JT8BF28G1W
P0171: Fuel System Too Lean (Bank 1). ... with p0171 and p0420-at that time we replaced fuel filter and cleaned mass air sensor and replaced pcv. did a cat efficiency test with escan which revealed bad cat.so customer took it to exhaust shop and had cat and bank one upstream sensor replaced.p0420 ...
November 20, 2013
2001 Nissan Sentra GXE 1.8L Excessive Emissions, Poor Idle Quality, Hesitation, Misfire VIN: 3N1CB51D01
P0171: Fuel Trim Lean. On accel this car will just fall on it's face and just surge. The engine makes that noise you hear when the engine is starving for fuel like a fuel pump is going bad and when you accel you hear the loud air noise coming from the throttle body. Don't know any o...
November 20, 2013
2005 Volkswagen Jetta GL 2.0L MIL Lamp on VIN: 3VWRK69M25
P0171: testing and results. ... and p0171. Checked the maf and it was dirty as can be so we replaced it and test drove car. Seemed OK so we gave it back to customer. Next day he called and said after 30 minutes of driving the check engine light came bac...
November 21, 2013
1998 Lexus ES300 3.0L MIL Lamp on VIN: JT8BF28G1W
P0171: Fuel System Too Lean (Bank 1). ... with p0171 and p0420-at that time we replaced fuel filter and cleaned mass air sensor and replaced pcv. did a cat efficiency test with escan which revealed bad cat.so customer took it to exhaust shop and had cat and bank one upstream sensor replaced.p0420 ...
November 22, 2013
2000 Ford Explorer XLS 4.0L Poor Idle Quality VIN: 1FMZU62X3Y
P0171: system too lean Bank 1. ... is not reading anything on my scan tool and have p0171 and p0174 system too lean bank 1 and 2. I have replaced down stream 02 sensor, smoked tested for vacuum leaks and none were found. Also I cleaned the MAF sensor and is...
November 25, 2013
2004 Ford F-150 FX4 5.4L Misfire, MIL Lamp on VIN: 1FTPW14514
P0171: Lean Bank 1. ... results are from freeze frame for P0171, Fuel pressure is within spec KOEO and Matches PID for FRPS, test drove MAF reading max was only 180 G/sec, replaced MAF with NAPA reman, MAF reading now maxes out at 200 G/sec, checke...
November 29, 2013
2007 Pontiac G6 2.4L Poor Idle Quality VIN: 1G2ZG58B67
P0171: Fuel System Lean. ... the system p0121,and p0171 i have checked for vaccum leaks and have found none.aftter further investigation on line iwe decided too change the throttle body for these codes after doing so the idle has been stuck over 2300 rpm everytime i start the vehicle....
November 29, 2013