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P0171 Diagnostic Trouble Code Discussion for March 2012

Fuel System Lean (Bank 1)


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Trouble Ticket Help Requests for DTC P0171
Help Request Posted
1996 Lincoln Town Car Anniversary 4.6L MIL Lamp on VIN: 1LNLM82W3T
P0171: fuel system lean bank 1. This a good one here. Setting code p0171 - fuel system lean bank 1. short and long term fuel trims very high on bank 1 only. replaced bank 1 o2 sensor - sensor was black like it is actually running rich. tried mass air flow sensor. smoke tested for vacuum leak...
March 01, 2012
1996 Ford F-350 XL 7.5L MIL Lamp on VIN: 2FTHF36G9T
P0171: bank 1 lean. I have a strange lean code that can't be properly diagnosis. Airflow meter is working correctly. Baro at 151 at sea level. . I cleaned it and end up replacing it (rebuilt,carquest) to same condition. Their are no vacuum leaks, All vacuum hoses was plugged. Smo...
March 02, 2012
2005 Toyota Matrix 1.8L MIL Lamp on VIN: 2T1KR32E25
P0171: Fuel System Too Lean (Bank 1). ... matrix here kicking my a_s with a p0171 code. the trims are hi 35% at idle and driving. i've tried everything i can thing of no luck.does anyone have a suggestion? i've re smoke chk'd, tried propane around intake,motor vac,new maf(beck arnley)pcm was repla...
March 02, 2012
1996 Lincoln Town Car Anniversary 4.6L MIL Lamp on VIN: 1LNLM82W3T
P0171: fuel system lean bank 1. This a good one here. Setting code p0171 - fuel system lean bank 1. short and long term fuel trims very high on bank 1 only. replaced bank 1 o2 sensor - sensor was black like it is actually running rich. tried mass air flow sensor. smoke tested for vacuum leak...
March 05, 2012
2004 Cadillac XLR 4.6L MIL Lamp on
P0171: Fuel Trim System Lean (Bank 1). ... weeks nightmare. I have a relatively low mileage XLR Caddilac which came in with no real running problem, but this P0171 lean condition code. Engine runs smooth with no hesitation or obvious power problem. At first I erased the code and it didn't return fo...
March 06, 2012
2005 Jaguar S-Type Sport 4.2L MIL Lamp on, fuel trims VIN: SAJWA01UX5
P0171: bank 1 lean. On this visit, I tried a brand new air mass meter first thing. Swapping it out brought total fuel trims to +10% on both banks where previously b1 was at +17ltft and 0stft, b2 was at +10ltft and +6stft. I gave it a good test drive and watched fuel trims, I note...
March 14, 2012
2004 Cadillac XLR 4.6L MIL Lamp on
P0171: Fuel Trim System Lean (Bank 1). ... weeks nightmare. I have a relatively low mileage XLR Caddilac which came in with no real running problem, but this P0171 lean condition code. Engine runs smooth with no hesitation or obvious power problem. At first I erased the code and it didn't return fo...
March 15, 2012
1998 Ford F-150 Lariat 4.6L MIL Lamp on VIN: 1FTZX18W6W
P0171: lean bank 1. this 4.6 runs good while running down the road and fuel trims stay +-5% but when you idle for a couple minutes fuel trims jump to 35% or more. i tried everything i can think of. it acts like a vacuum leak but cannot find any. I had a like vehicle so swaped maf...
March 15, 2012
1999 Plymouth Grand Voyager Expresso 3.8L Poor Idle Quality, Hesitation, Cuts out, Stall, Poor Fuel Economy, MIL Lamp on VIN: 1P4GP44L5X
P0171: Fuel System Lean (Bank 1). I replaced the spark plugs & front 02 about two weeks ago. The weather here has become warm in the last week (70's). When the weather was warm & the engine had been run for a while, the front 02 would go to 0 volts, fuel trim to +25 & the engine wo...
March 16, 2012
1996 Chevrolet S10 LS 2.2L Surge, MIL Lamp on VIN: 1GCCS1946T
P0171: Fuel System Lean. ... of your advice and experience on determining what is wrong with this vehicle. The following vehicle has trouble code P0171=Fuel Trim System Lean. Freeze Frame Data is as followes: AF Ratio=14.6:1 Calc. Air Flow=36.73 g/s ECT=190F BARO=101kPa Base PWM Cyl.1...
March 20, 2012
1996 Chevrolet S10 LS 2.2L Surge, MIL Lamp on VIN: 1GCCS1946T
P0171: Fuel System Lean. ... of your advice and experience on determining what is wrong with this vehicle. The following vehicle has trouble code P0171=Fuel Trim System Lean. Freeze Frame Data is as followes: AF Ratio=14.6:1 Calc. Air Flow=36.73 g/s ECT=190F BARO=101kPa Base PWM Cyl.1...
March 22, 2012
1999 GMC Sierra 1500 SL 5.3L MIL Lamp on VIN: 1GTEK19T1X
P0171: Fuel Trim System Lean (Bank 1). ... was brought to me with a missfire and MIL on with code p0300. miss fire count showed #6 with the most counts. found injector connector had been damaged. i replaced all 4 injector connectors on bank 2. (soldered connections and shrink wrapped) test drive pr...
March 22, 2012
2002 Mercedes-Benz C230 Kompressor 2.3L Poor Idle Quality VIN: WDBRN47J92
P0171: mixture is too lean in the part load range. we have a c230 kompressor with faults for being too lean, watched fuel mixture values while driving and saw that it was adding fuel everywhere. long term fuel trim is at +18% checked fuel pressure and found 3.8 bar present. smoke tested vehicle and found no ob...
March 22, 2012
1996 Ford E-250 Econoline XL 5.8L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1FTFS24H2T
P0171: lean bank 1. ... e250 van here giving me a little bit of a problem. came in with mil on and code P0171 in memory. checked tsb's and found a reflash for fuel trim codes. also van had original plugs and wires on it. i should also state that i did a cylinder contribution test...
March 29, 2012
2001 Toyota Tacoma Pre Runner 3.4L MIL Lamp on VIN: 5TESN92N11
P0171: Fuel System Too Lean (Bank 1). Hi guys, Have this Tacoma (a friends) and it keeps setting a PO171 lean code. He had it at the dealer and they replaced the A/F ratio sensor for the Po171. They also told him he needed a new cat convertor. I replaced the MAF with a dealer part. I have smoke t...
March 29, 2012