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P0171 Diagnostic Trouble Code Discussion for April 2015

Fuel System Lean (Bank 1)


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Trouble Ticket Help Requests for DTC P0171
Help Request Posted
2006 BMW 325i 3.0L MIL Lamp on VIN: WBAVB13516
P0171: Lean. This car is driving me crazy please help at idling calculated load 5% air mass meter reads 3.2 g/s b1 stft 24% ltft 25% b2 stft 27% ltft 27 2500 rpm calculated load 11% air mass meter 10 g/s b1 stft 16% ltft 4% b2 stft 13% ltft 4%
April 01, 2015
1996 Ford F-250 XL 7.5L Hesitation, MIL Lamp on VIN: 1FDHF25G0T
P0171: Lean bank 1. ... pcm p0172, p0175, p0171 and p0420. upon inspection noticed that vehicles CAT had been removed so please ignore p0420. checked freeze frame data code p0172 STFT B1 -3.9 STFT B2 0 LTFT B1 -10.9 LTFT B2 -12.5 LOAD 57.6% ECT 1...
April 04, 2015
2000 Acura TL 3.2L No Start, Misfire, MIL Lamp on VIN: 19UUA5663Y
P0171: Fuel System Too Lean (Bank 1). Good afternoon, this problem began serveral months ago as far as we can tell. Customer reported MIL - we verified misfires and installed a set of NGK spark plugs ( as recommended by Worldpak ). A few months later, misfires again, we installed a set of ignition...
April 07, 2015
1996 Ford F-250 XL 7.5L Hesitation, MIL Lamp on VIN: 1FDHF25G0T
P0171: Lean bank 1. ... pcm p0172, p0175, p0171 and p0420. upon inspection noticed that vehicles CAT had been removed so please ignore p0420. checked freeze frame data code p0172 STFT B1 -3.9 STFT B2 0 LTFT B1 -10.9 LTFT B2 -12.5 LOAD 57.6% ECT 1...
April 07, 2015
2000 Acura TL 3.2L No Start, Misfire, MIL Lamp on VIN: 19UUA5663Y
P0171: Fuel System Too Lean (Bank 1). Good afternoon, this problem began serveral months ago as far as we can tell. Customer reported MIL - we verified misfires and installed a set of NGK spark plugs ( as recommended by Worldpak ). A few months later, misfires again, we installed a set of ignition...
April 11, 2015
2000 Ford Ranger XL 4.0L Poor Idle Quality, Surge, MIL Lamp on VIN: 1FTYR14X7Y
P0171: system lean bank 1. has new MAF and TPS with new harness, New IAC which is responding normally. long fuel trims act as if there is a vacuum leak, they decrease (move toward 0) as rpm increases, the short fuel trims increase as the rpms go up.. Has me a little confused.. vehicle d...
April 17, 2015
2008 Chevrolet Silverado 1500 WT 4.3L Poor Idle Quality, MIL Lamp on VIN: 1GCEC14X38
P0171: Lean b1. Hi guys. This thing is so intermitant, when i see it act up on scanner and go lean at idle, im not at the shop to ck it out. Always on test drive, cant duplacate in shop. Readings look good + - 3 trims.when it acts up it goes 24 +. Short just b1. B2 stays ok. ...
April 18, 2015
2003 Chevrolet Silverado 1500 5.3L Misfire VIN: 2GCEK19T03
P0171: Fuel Trim System Lean (Bank 1). I am posting this to help a friend at another shop. He has a 03 Chevrolet 5.3 that is missing out on cylinders 2 and 7 at idle. Anything above 990 rpm and it is running fine. After replacing the intake gasket and clearing the codes, the only code now is P0300....
April 20, 2015
2002 Subaru Impreza WRX 2.0L Hesitation, Cuts out, Misfire VIN: JF1GD29672
P0171: Fuel System Too Lean (Bank 1). Unplugging MAF sensor makes it run normally, tried a known good OEM MAF with no change. It would seem that it still has a bad MAF but a total of three new have been installed with zero change.
April 23, 2015
2002 Subaru Impreza WRX 2.0L Hesitation, Cuts out, Misfire VIN: JF1GD29672
P0171: Fuel System Too Lean (Bank 1). Unplugging MAF sensor makes it run normally, tried a known good OEM MAF with no change. It would seem that it still has a bad MAF but a total of three new have been installed with zero change.
April 27, 2015
2007 GMC Sierra 3500 Classic WT 6.0L no drivability issue VIN: 1GDJK34U67
P0171: Fuel Trim System Lean (Bank 1). Thanks in advance. I can clear these codes and they will usually reset within 300-500 miles. I have test driven with fuel pressure gauge, pressure never drops below 62 psi. We are located at an elevation of 9200 feet. After checking iatn archives noted possibl...
April 28, 2015