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P0171 Diagnostic Trouble Code Discussion for February 2005

Fuel System Lean (Bank 1) *

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Trouble Ticket Help Requests for DTC P0171

	Help Request	Posted
	1997 Ford Explorer XL 4.0L Cuts out, MIL Lamp on, lack of power wot VIN: 1FMDU32X6V P0171: bank1 lean. ... ford. We have replaced the evap solenoid and hoses. Still get code p0446 (next day). the alldata says use the dreaded breakout box.and test wiring to and from ecm. We have 12v to solenoid. we found bulletin for copde p0446, that does not have my specific c...	February 01, 2005
	1997 Ford Explorer XL 4.0L Cuts out, MIL Lamp on, lack of power wot VIN: 1FMDU32X6V P0171: bank1 lean. ... ford. We have replaced the evap solenoid and hoses. Still get code p0446 (next day). the alldata says use the dreaded breakout box.and test wiring to and from ecm. We have 12v to solenoid. we found bulletin for copde p0446, that does not have my specific c...	February 02, 2005
	1998 Ford Explorer Eddie Bauer 4.0L Poor Idle Quality, Surge, Stall, MIL Lamp on VIN: 1FMZU34E3W P0171: bank 1 lean. Hey Ford Techs, Truck came in with check engine light on (codes for lean banks 1 & 2 ). Also on cold starts rough idle and surges up and down, sometimes may die. It needed a tune up( plugs worn and air filter dirty ). I found dirty fuel filter with a small...	February 02, 2005
	1998 Volvo V70 2.4L MIL Lamp on P0171: fuel adaptation. Hello All, I apologize for not having the vin. I am posting from home and do not have the vin. info. The car is a 1998 volvo V70XC AWD with a 2.5L 5 cyl. turbo. The problem is a recurring code PO171. I am scanning the computer with a generic scan tool. My fir...	February 02, 2005
	1996 Mercury Cougar XR-7 4.6L MIL Lamp on VIN: 1MELM62W8T P0171: system too lean bank 1. ... all Heater Ckt's on 02 sensors. Also P0171 & P0174-lean codes. and one P0156 description is HO. Cleared codes and test drove, all 02 sensor codes came back on. Checked all sensor connect...	February 04, 2005
	1998 Volvo V70 2.4L MIL Lamp on P0171: fuel adaptation. Hello All, I apologize for not having the vin. I am posting from home and do not have the vin. info. The car is a 1998 volvo V70XC AWD with a 2.5L 5 cyl. turbo. The problem is a recurring code PO171. I am scanning the computer with a generic scan tool. My fir...	February 05, 2005
	1999 Ford Contour LX 2.0L MIL Lamp on VIN: 1FAFP663OX P0171: lean. this car everything is ok when its here i have tried a new front o2 sensor and a new maf sensor after about one week it will set the code again ican not find a vac leek please help thank you bill [...]	February 07, 2005
	1999 Mercury Cougar 2.5L MIL Lamp on VIN: 1ZWFT61LXX P0171: Lean Bank 1. Just helping out another tech in the shop with this car. Appears to have a vacuum leak under the plenum or thereabouts. We use a pressurized smoke machine to force smoke in to the intake manifold. Getting trace amounts of smoke from underneath the plenum. My q...	February 08, 2005
	2000 Nissan Maxima GLE 3.0L Poor Idle Quality, MIL Lamp on VIN: JN1CA31D9Y P0171: Fuel Trim Lean (Bank 1). ... with p1320 and p0171, the customer complained of a rough idle when cold, i called nissan to price out a coil and they said they replace all 6 coils at one time, of course extended warranty would only approve 2 coils(which supprised me)i also found that the...	February 08, 2005
	2000 Ford Contour SE 2.5L Stall VIN: 1FAFP66L3Y P0171: System too lean bank 1. I have a new updated OEM pump module which requires the removal and discarding of a lower pump locating/retaining ring before installation of the new assembly. There is a special tool #310-133 designed to cut the 4 retaining tabs. My Ford parts man says @10 da...	February 15, 2005
	1999 Land Rover Range Rover HSE 4.6L MIL Lamp on VIN: SALPV1445X P0171: bank 1 lean. We have this RR here with lean codes and the LTFT for both banks in excess of +20%. We smoked the intake and found no vacuum leaks. When we checked MAF with a lab scope on a snap throttle test it started at 1.55v idle and snapped to only 3.41v max. This seems ...	February 15, 2005
	1999 Toyota 4Runner SR5 3.4L Excessive Emissions, MIL Lamp on VIN: JT3HN86R0X P0171: Fuel System Too Lean (Bank 1). This 4Runner runs great while in shop and most times while running down the road the fuel trim stays very close to a +/_10%. When doing 65 mph around 2500 rpm and under load and normal operating temp the LT fuel trim goes to 37%, not always though. Even in che...	February 15, 2005
	1999 Ford Windstar SE 3.8L MIL Lamp on VIN: 2FMZA524OX P0171: lean. checked "tsb" found 1 on this. it said to change left valve cover,intake gaskets and flash the pcm. i was wondering if anyone has run across the same problem and tried this fix??if so,was it sucessful??? any help would be appreciated!	February 16, 2005
	2000 Nissan Maxima SE 3.0L MIL Lamp on VIN: JNICA31AXY P0171: Fuel Trim Lean (Bank 1). hy guys this car is a nieghbor of mine he is complaining the engine light comes on, i scan the computer and found lean fuel on both banks, i hear a vaccum sound coming from the intake manifold, but it is plastic so i do not no if this is a normal noise, check ...	February 21, 2005
	2002 Oldsmobile Alero GL 2.2L Hesitation, Stall, MIL Lamp on VIN: 1G3NL52F93 P0171: Fuel Trim System Lean. fuel pressure and flow checks ok so does o2 sensors ,injectors and converter Car acts like it is running out of gas only does it on occasion. Any ideas as to what im missing?	February 21, 2005
	1997 Dodge Stratus 2.4L MIL Lamp on VIN: 1B3EJ46X8V P0171: Fuel System Lean (Bank 1). Hello this Dodge Stratus keeps going through up stream o2 sensors.Replaced sensors with oem sensors 3 times and they work for about 2000 miles and go dead-quit producing voltage.Checked pwrs&grounds for heater circuit & o2 circuit.	February 22, 2005
	2001 GMC Sierra 1500 SL 5.3L MIL Lamp on VIN: 1GTEK19T01 P0171: Fuel Trim System Lean (Bank 1). ... 2 months time. Truck would sometimes, usually cold but sometimes at cruise miss loose power, not pull. After 1-5 minutes would clear up, run fine, maybe rest of day or ok for 3-4 days. Well back today, lean bank codes p0174, p0171, but no misfire history n...	February 22, 2005
	1998 Mercury Sable LS 3.0L MIL Lamp on VIN: 1MEFM55S4W P0171: System too lean bank 1. ... Sable station wagon with the 3.0 liter Duratec “S" engine. There has not been an engine performance complaint by the customer, but the check engine light keeps on resetting, storing a P0171 (system too lean bank 1), and a P0174 (system too lean bank ...	February 24, 2005
	1996 Lincoln Continental Anniversary 4.6L MIL Lamp on VIN: 1LNLM97V8T P0171: System too Lean Bank 1. This vehicle has got me stumped badly. At idle fuel trims are pretty close to 0. They hang around +4 to +7%, at partial throttle, medium load, the fuel trims max out at 25%, at WOT the car pulls fine and HO2S voltage stays above .9V. Partial throttle is where ...	February 25, 2005