Join Now
International Automotive Technicians Network

P0171 Diagnostic Trouble Code Discussion for September 2005

Fuel System Lean (Bank 1)


Note: This is a professional automotive technician's resource.
Vehicle Owners: If you are seeking an automotive repair professional to service your vehicle, visit the iATN Repair Shop Finder.

Trouble Ticket Help Requests for DTC P0171
Help Request Posted
1998 Ford Contour LX 2.5L MIL Lamp on VIN: 1FAFP66L9W
P0171: lean bank 1. ... before repair also, disconected bat to reset baro reading, it was at 151hz after test drive, i don't do enough fords to remember what's normal for my area, but seems low to me. freze frame showed P0171 set at idle.
September 01, 2005
2000 Ford Explorer XLT 4.0L MIL Lamp on VIN: 1FMZU73E2Y
P0171: Bank 1 system lean. This Explorer origanally came in for cold morning start and stall. Also had mil on for bank 1 and 2 lean. Intake gaskets were replaced and all seemed well. Two weeks later customer returned with mil back on but running good. The engine was smoke tested for vac...
September 01, 2005
1995 Ford Windstar GL 3.8L MIL Lamp on VIN: 2FMDA5147S
P0171: lean bank 1. ... drivability concerns. Scan shows code P0171 lean bank 1. STFT +5 to -5% both banks. LTFT +12 to +18% idle, +5 to +9% cruise. I notice no drivability concerns. I removed MAF sensor & elements were covered with fuzz on inlet side so I cleaned it. The pro...
September 07, 2005
2001 Nissan Sentra GXE 1.8L Hesitation VIN: 3N1CB51D91
P0171: Fuel Trim Lean. Well guys I went too look @ this one for a friend and was convinced it was a fuel pump(even though mileage is low). The car would not get out of its one way just bog and act like it wasn't getting enough fuel. Since I'm lookin @ this after work and had no fuel...
September 07, 2005
2000 Volvo V70 GLT SE 2.4L MIL Lamp on VIN: YV1LW56DXY
P0171: Long term fuel trim. Volvo Techs...Help. We work on a lot of Volvo's and are stumped on the Swedish engineering for this one. The fuel pressure is too high. It originally came in for MIL and runing rough. We found 3 Injectors leaking and the engine had no compression in 1 hole due...
September 08, 2005
1998 Ford Contour LX 2.5L MIL Lamp on VIN: 1FAFP66L9W
P0171: lean bank 1. ... before repair also, disconected bat to reset baro reading, it was at 151hz after test drive, i don't do enough fords to remember what's normal for my area, but seems low to me. freze frame showed P0171 set at idle.
September 10, 2005
1996 Ford Explorer Eddie Bauer 4.0L MIL Lamp on VIN: 1FMDU34X0T
P0171: lean exhaust bank 1. I am looking for direction on this one as it came in from another shop, the owner is cofinced that the 02 sensors sre causeing the problem I beleive it to be a mass air flow problem. could use some real world advice. Thanks Mike
September 15, 2005
1999 Honda Accord LX 2.3L Hesitation, MIL Lamp on VIN: 1HGCG5642X
P0171: Fuel System Too Lean (Bank 1). the car came in with codes p1491, p1259, po171 and po401. the ports in the intake for the egr were plugged so the intake plenium was removed and the ports were cleaned. THE ONLY CODE THAT CAME BACK WAS po171 bank 1 system lean. The oxygen sensor is responding ...
September 15, 2005
2002 Volkswagen Jetta GLS 1.8L MIL Lamp on VIN: 3VWSE69M02
P0171: lean bank 1. mil light comes on when car is driven on a long drive.i checked for vacuum leaks found none.replaced upstream 02 sensor and maf sensor but light still comes on after you drive it about 10 miles. Thanks for any help chuck
September 17, 2005
2002 Chevrolet Trailblazer LS 4.2L MIL Lamp on VIN: 1GNDT13S32
P0171: Fuel System Lean (Bank 1). This one has a p0171 bank 1 lean. Fuel pressure is 54 psi. LT trim is at 20+ at idle.. I used the smoke machine 3 different times with no results.. Tried spraying down the intake, vac hoses, injector rail, t-body, etc. with no changes in fuel trim numbers. I a...
September 20, 2005
2001 Toyota 4Runner SR5 3.4L MIL Lamp on VIN: JT3HN86R61
P0171: Fuel System Too Lean (Bank 1). This code says that the system requires too much fuel enrichment - system running too lean. The code tree led us to replace air/fuel ratio sensor. (oxygen sensor) We have checked fuel pressure and inspected for possible vacuum leaks. Vehicle runs well. The cod...
September 21, 2005
2002 Chevrolet Trailblazer LS 4.2L MIL Lamp on VIN: 1GNDT13S32
P0171: Fuel System Lean (Bank 1). This one has a p0171 bank 1 lean. Fuel pressure is 54 psi. LT trim is at 20+ at idle.. I used the smoke machine 3 different times with no results.. Tried spraying down the intake, vac hoses, injector rail, t-body, etc. with no changes in fuel trim numbers. I a...
September 22, 2005
2000 Volkswagen Jetta GL 2.0L Poor Idle Quality, Hesitation VIN: 3VWSK29M81
P0171: System too lean. ***Any help is appreciated*** The client returned the vehicle with only an additional 13 miles on it since maf replacement. Started engine for road test, all systems normal at this time. Parked vehicle and tried later after car had been sitting in the sun all ...
September 22, 2005
2003 Buick Century 3.1L MIL Lamp on
P0171: Fuel System Lean. This car came in with a MIL light on. P0171 lean code .We checked fuel pressure ok,replaced fuel filter and front O2 sensor and light came on again for the people.We were thinking fuel regulator or vacuum leak but dealer said they don't have problems so we dec...
September 24, 2005
1999 BMW 740iL 4.4L MIL Lamp on, CODES 171 &174 VIN: WBAGH8333X
P0171: bank 1 system lean. ... light has been coming on for 3 months or so. I erase codes, they will remain gone for a day or so. Check engine light comes on with no drive ability. Pull same codes p0171 & p0174 BOTH BANKS LEAN. O2 sensors look good when taken for a test drive. ALL 4...
September 26, 2005
2003 Buick Century 3.1L MIL Lamp on
P0171: Fuel System Lean. This car came in with a MIL light on. P0171 lean code .We checked fuel pressure ok,replaced fuel filter and front O2 sensor and light came on again for the people.We were thinking fuel regulator or vacuum leak but dealer said they don't have problems so we dec...
September 26, 2005
1999 Buick Regal LS 3.8L MIL Lamp on VIN: 2G4WB52K0X
P0171: Fuel System Lean. I hope someone has seen this before we have been screwing with this for about 3 days now. Vehicle came in with code po171 and both LTFT and STFT peg at full rich compensation +16.4 LT and +20 ST. Found the O Ring under the PCV missing and replaced it. The STFT...
September 27, 2005
2002 Ford F-150 King Ranch 5.4L Hesitation, Stall, MIL Lamp on VIN: 2FTRX18L42
P0171: system lean bank one. Hello all,This truck has stalled twice on the customer but never on us. Truck restart for customer on first crank,customer has also said truck stumble at times, have been unable to make truck act up for us. Fuel psi with vacuum line on reg. is 36 psi..with vac...
September 28, 2005
1999 Ford Windstar LX 3.8L MIL Lamp on VIN: 2FMZA5142X
P0171: sys. too lean bank 1. changed oxy. sensors, fuel filter-intake gaskets,cleaned mass air flow. reset cam, cleaned injectors. Came back 2 wks later. same thing. any suggestions?
September 29, 2005