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P0171 Diagnostic Trouble Code Discussion for June 2010

Fuel System Lean (Bank 1)

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Trouble Ticket Help Requests for DTC P0171
Help Request Posted
1998 Pontiac Grand Prix GT 3.8L Surge, MIL Lamp on VIN: 1G2WP12K5W
P0171: Fuel System Lean (Bank 1). clear code po171 ,reset fuel trim with tech 2, start engine and as it warms up the o2 voltage starts to drop to about .10 ,then it goes into closed loop and fuel trim rises to 16% slight idle surge and sets po171 has good fuel press and volume 47 psi running ,...
June 03, 2010
1999 Toyota Camry LE 2.2L Hesitation VIN: 1324546475
P0171: Fuel System Too Lean (Bank 1). ... all this is a california emmisions vehicle. Had a p0171 code, lean bank 1. Brought in for a poor running condition and low power. removed the exhaust before the cat conv and power was regained. replaced cat converter an...
June 03, 2010
2004 BMW X3 3.0i 3.0L Poor Idle Quality, Misfire, MIL Lamp on VIN: WBXPA93484
we had a 2004 bmw x3 3.0L come in with mil light on. it read multiple misfires and a p171 and p174. the boot to the throttle body was weak and had a small hole in it. we hooked the verus up and i had 3 misfires. it was time to change the plugs, so we changed t...
June 05, 2010
2000 Ford F-250 Super Duty XL 5.4L Surge, Cuts out, Stall, Misfire VIN: 1FDNF21L6Y
P0171: Lean Bank 2. Truck runs good sometimes then it starts idling like it has a racing cam. Before I can test anything it may start running fine again. Short term fuel adaptive is at -20% and long term is at -25% only on bank 2. The other bank hovering arround +5% to -5% in lon...
June 07, 2010
1998 Pontiac Grand Prix GT 3.8L Surge, MIL Lamp on VIN: 1G2WP12K5W
P0171: Fuel System Lean (Bank 1). clear code po171 ,reset fuel trim with tech 2, start engine and as it warms up the o2 voltage starts to drop to about .10 ,then it goes into closed loop and fuel trim rises to 16% slight idle surge and sets po171 has good fuel press and volume 47 psi running ,...
June 07, 2010
2000 Toyota Celica GT 1.8L Hesitation VIN: JTDDR32TXY
P0171: Fuel System Too Lean (Bank 1). ... and end up buying a new maf sensor. it lessen the hesitatation on accelaration but still there. I also did a fuel injection cleaning and i think it fixed the problem,Test drive the car 3 times check engine light keep coming back same code P0171 and release...
June 07, 2010
2000 Chevrolet Silverado 2500 LS 6.0L Poor Idle Quality, Hesitation, Misfire, Poor Fuel Economy, MIL Lamp on VIN: 1GCFC29U8Y
P0171: Fuel Trim System Lean (Bank 1). ... due to engine misfire. Got codes po158, po300, po171 and p0405. When the engine goes into closed loop, the engine will misfire on number 2,4,6, and 8 which is one bank. Number 1,3,5,7 has no misfire at idle. Replace the oxygen sensor on bank 2 sensor 2 and...
June 09, 2010
2005 Chevrolet Uplander 3.5L Excessive Emissions, Poor Idle Quality, Cuts out, Stall, Poor Fuel Economy
P0171: Fuel System Lean. ... called a fuel pump. I started van right up and as the idle came down it started running worse and worse. Eventually it started smoking black out the tailpipe and would barely idle. Scanned found p0171 and rpm higher than expected. when running poorly the f...
June 09, 2010
2003 Dodge Ram 2500 5.7L Cuts out, Stall VIN: 3D7KU28D23
P0171: Lean Bank 1. ... customer says after about 35+ miles it will go to running real bad and loses power and eventually stall. After the stall the truck will not start till the next day. I have put over 70 miles on this truck and have had no problems. Everything on the scanner ...
June 09, 2010
2001 Audi A4 Quattro 1.8L none VIN: WAUDC68D61
P0171: lean bank 1. ... checked codes and found p0171 ch all over for leaks and found 2 broken vac hoses. vehicle went back to dealer for some recall work with sec air system, and light must have come back on. customer mentions something dealer told them about mass air flow senso...
June 14, 2010
2004 Ford E-350 Super Duty 5.4L Misfire, MIL Lamp on VIN: 1FDWE35L14
P0171: System lean bank1. Ok guys, i'm not the best driveability guy out there, and this ones got me stumped. This is a minibus that sits at idle a lot. It came to me running fine but when i let it sit at idle after 10 or 15 minutes it starts to missfire and the fuel trim goes up to 22...
June 14, 2010
2001 Ford F-150 XL 4.2L MIL Lamp on VIN: 1FTZX17271
P0171: system lean bank 1. ... vehicle, had codes p0171 and p0174 system lean bank 1 and 2. located large vacuum leak at right side of lower intake manifold, we replace lower gaskets and plenum gasket with oem. recheck fuel trim, bank 1 is still lean during all condtion, idle, cruise, h...
June 16, 2010
2004 Ford Explorer XLT 4.6L MIL Lamp on VIN: 1FMZU73W24
P0171: Lean fuel system bank 1. Hey guys, need some help with one. This truck runs with the short term at 25-45 at idle. You barely tip in the throttle and it returns to normal. We have smoke tested and can not find any leaks. We replaced egr hoping to find problem- did not change. Truck run...
June 16, 2010
2001 Nissan Sentra GXE 1.8L Poor Idle Quality, Stall, MIL Lamp on VIN: 3N1CB51D71
P0171: Fuel Trim Lean. Hi every one, Vehicle described above has stalling problem at Idle in drive. When idling in drive seem like its starving from fuel. scantool oxygen sensor both banks goes flat line (leas than 100 mV Lean)when idle in drive. I asumed that less fuel , induced pr...
June 16, 2010
1999 Ford E-250 Econoline 5.4L Poor Idle Quality, MIL Lamp on VIN: 1FTPE24L3X
P0171: Lean Bank 1. Hello everyone, I have poor Econoline Van that's kinda kicking my butt. The Problem it that I has a poor idle and will set a lean code on bank 1,+ 25% and drops off idle. I have smoke tested and leak tested the intake till I was blue in the face. The only bad ...
June 23, 2010
2005 GMC Sierra 1500 5.3L MIL Lamp on VIN: 2GTEK13T75
P0171: Fuel Trim System Lean (Bank 1). Vehicle has been to my shop on three occasions with MIL on and PO171 stored. Vehicle has no running problems. All of the data looks normal. Fuel trims always look in spec. Can not find any vacuum leaks. I can clear the codes and MIL will stay off for about a w...
June 28, 2010
2001 Lexus RX300 3.0L Hesitation VIN: JTJHF10UX1
Hi All, I really would appreciate your input on this as it seems it may be a wild goose chase. The complaints are hesitation on highway. Codes are listed below. It seems to me that the rear A/F sensor bank 2 is out but I really have not enough knowledge to co...
June 29, 2010
2007 Audi A4 Quattro Cabriolet 2.0L MIL Lamp on VIN: WAUDF48H67
P0171: bank 1 too lean. Hey Audi Techs...This car runs very well with good power, but the fuel trims at idle are +25...the max. We smoke tested the induction expecting to find a substantial vacuum leak...no such luck, the system is quite tight! Normal driving allows for normal fuel t...
June 30, 2010