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P0171 Diagnostic Trouble Code Discussion for July 2006

Fuel System Lean (Bank 1)


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Trouble Ticket Help Requests for DTC P0171
Help Request Posted
2002 Ford Ranger Edge 3.0L Hesitation, Misfire, MIL Lamp on VIN: 1FTYR10U72
P0171: system lean bank one. truck still has missfire, did read about catalytic problems, but this truck will run ok at times.
July 06, 2006
1998 Ford E-350 Econoline 6.8L MIL Lamp on VIN: 1FDWE3OSXW
P0171: system too lean bank 1. intermittent codes p0171 [...]
July 07, 2006
2000 Ford E-150 Econoline 4.2L MIL Lamp on VIN: 1FTRE1422Y
P0171: lean bank 1. One big headache, MIL keeps triggering after one day. This truck is a fleet service vehicle. Keeps triggering MIL for lean codes on both banks, looked for a vacuum leak and found intake and fixed. good for about two days and came back today same codes again. A...
July 07, 2006
2001 Mercury Sable LS Premium 3.0L Poor Idle Quality, Misfire, Poor Fuel Economy, MIL Lamp on VIN: 1MEFM55S01
P0171: system too rich bank 1. hi group, i have posted on this car before and didnt get any useful info. the car left and is now back. runs rich, ltft bank 1 -22%, ltft bank 2 -11% and misses on cyl 1 intermittantly. my main question at this point is, is 65 psi of fuel pressure too much? i ...
July 08, 2006
2000 Mercury Sable LS Premium 3.0L No Start, Stall, MIL Lamp on VIN: 1MEFM55SZY
P0171: system to leak bank 1. customer came in said he had the intake gaskets done fuel regulator and rail 02 sensors when on the scanner both o2 sensors are very slow (they are new)we checked for vacuum leaks and found a large leak under intake replaced upper and lower gasket sets code st...
July 11, 2006
2001 Mercury Sable LS Premium 3.0L Poor Idle Quality, Misfire, Poor Fuel Economy, MIL Lamp on VIN: 1MEFM55S01
P0171: system too rich bank 1. hi group, i have posted on this car before and didnt get any useful info. the car left and is now back. runs rich, ltft bank 1 -22%, ltft bank 2 -11% and misses on cyl 1 intermittantly. my main question at this point is, is 65 psi of fuel pressure too much? i ...
July 12, 2006
1999 Toyota 4Runner SR5 3.4L MIL Lamp on VIN: JT3GN86R7X
P0171: Fuel System Too Lean (Bank 1). ... has returned multiple times now with a p0171 code stored in it the first time it came in the o2 seemed to be slow so we replaced it and performed a tune up plugs, wires ,fuel filter, air fiter. The veh returned again same condition the light only sets when...
July 12, 2006
2004 Ford Freestar 3.9L MIL Lamp on VIN: 2FTZA54634
P0171: system too lean bank 1. I need some help with this 2004 Freestar. The vehicle came in for PA state emissions with check engine light on, and failed with codes po171 and po174. I have had older Windstar 3.8's with same codes, and have done the TSB for plenum seals, bolts, and\or valve...
July 14, 2006
1998 Jeep Wrangler SE 2.5L Excessive Emissions, Poor Idle Quality, Misfire, Poor Fuel Economy, MIL Lamp on VIN: 1J4FY29P9W
P0171: Fuel System Lean (Bank 1). This vehicle came in running poorly. customer had tried to tune it up new plugs, wires, cap rotor and o2 sensor. checked system and found o2 sensor severly carboned up. replaced o2 sensor. vehicle ran fine all scanner numbers looked fine. returned 2 weeks late...
July 17, 2006
1995 Chevrolet Blazer 4.3L Excessive Emissions, Poor Fuel Economy, MIL Lamp on VIN: 1GNDT13W1S
P0171: lean. Helping out the shop foreman here, and hoping to show him the value of IATN at the same time. We suspect a wiring problem. I read thru the archives and found many emissions problems, but none with these codes. We have inspected the wire harness, and are about ...
July 20, 2006
2003 Ford Ranger XL 2.3L Hesitation, MIL Lamp on VIN: 1FTYR10D33
P0171: system lean. Got this one 2day very low mileage bad hesitation and runs rough off the line seems too clear up some after it gets going... has a lean symptom to it.. Im seeing longterm fuel trim @ 9 or so @ idle and up to 20 going down the road or off idle. It idles ok but ...
July 21, 2006
1999 Volvo V70 2.4L MIL Lamp on VIN: YV1LW55AOX
P0171: Long Term fuel trim low limit. Vehicle failed OBDII emission test. Both codes PO171 and PO455 present. Checked for vac. leaks first. Found usual broken vac. line under intake and repaired. Smoke test EVAP system. No leak found. Manually activated both the purge and vent valves. Both functio...
July 24, 2006
2000 Saturn LS2 3.0L Poor Idle Quality, Hesitation, Stall, Misfire, MIL Lamp on, Lack of Power VIN: 1G8JW52R9Y
P0171: Fuel Trim System Lean (Bank 1). Hello all, I have a Saturn here I'm having some difficulty diagnosing. The customer stated that after replacing the battery, the vehicle bucks and runs rough. The vehicle does run extremely rough, has a noticeable misfire (engine light flashes), stalls occassi...
July 26, 2006
2000 Saturn LS2 3.0L Poor Idle Quality, Hesitation, Stall, Misfire, MIL Lamp on, Lack of Power VIN: 1G8JW52R9Y
P0171: Fuel Trim System Lean (Bank 1). Hello all, I have a Saturn here I'm having some difficulty diagnosing. The customer stated that after replacing the battery, the vehicle bucks and runs rough. The vehicle does run extremely rough, has a noticeable misfire (engine light flashes), stalls occassi...
July 27, 2006
2002 Ford Ranger Edge 3.0L Hesitation, Misfire, MIL Lamp on VIN: 1FTYR10U72
P0171: system lean bank one. truck still has missfire, did read about catalytic problems, but this truck will run ok at times.
July 06, 2006
1998 Ford E-350 Econoline 6.8L MIL Lamp on VIN: 1FDWE3OSXW
P0171: system too lean bank 1. intermittent codes p0171 [...]
July 07, 2006
2000 Ford E-150 Econoline 4.2L MIL Lamp on VIN: 1FTRE1422Y
P0171: lean bank 1. One big headache, MIL keeps triggering after one day. This truck is a fleet service vehicle. Keeps triggering MIL for lean codes on both banks, looked for a vacuum leak and found intake and fixed. good for about two days and came back today same codes again. A...
July 07, 2006
2001 Mercury Sable LS Premium 3.0L Poor Idle Quality, Misfire, Poor Fuel Economy, MIL Lamp on VIN: 1MEFM55S01
P0171: system too rich bank 1. hi group, i have posted on this car before and didnt get any useful info. the car left and is now back. runs rich, ltft bank 1 -22%, ltft bank 2 -11% and misses on cyl 1 intermittantly. my main question at this point is, is 65 psi of fuel pressure too much? i ...
July 08, 2006
2000 Mercury Sable LS Premium 3.0L No Start, Stall, MIL Lamp on VIN: 1MEFM55SZY
P0171: system to leak bank 1. customer came in said he had the intake gaskets done fuel regulator and rail 02 sensors when on the scanner both o2 sensors are very slow (they are new)we checked for vacuum leaks and found a large leak under intake replaced upper and lower gasket sets code st...
July 11, 2006
2001 Mercury Sable LS Premium 3.0L Poor Idle Quality, Misfire, Poor Fuel Economy, MIL Lamp on VIN: 1MEFM55S01
P0171: system too rich bank 1. hi group, i have posted on this car before and didnt get any useful info. the car left and is now back. runs rich, ltft bank 1 -22%, ltft bank 2 -11% and misses on cyl 1 intermittantly. my main question at this point is, is 65 psi of fuel pressure too much? i ...
July 12, 2006
1999 Toyota 4Runner SR5 3.4L MIL Lamp on VIN: JT3GN86R7X
P0171: Fuel System Too Lean (Bank 1). ... has returned multiple times now with a p0171 code stored in it the first time it came in the o2 seemed to be slow so we replaced it and performed a tune up plugs, wires ,fuel filter, air fiter. The veh returned again same condition the light only sets when...
July 12, 2006
2004 Ford Freestar 3.9L MIL Lamp on VIN: 2FTZA54634
P0171: system too lean bank 1. I need some help with this 2004 Freestar. The vehicle came in for PA state emissions with check engine light on, and failed with codes po171 and po174. I have had older Windstar 3.8's with same codes, and have done the TSB for plenum seals, bolts, and\or valve...
July 14, 2006
1998 Jeep Wrangler SE 2.5L Excessive Emissions, Poor Idle Quality, Misfire, Poor Fuel Economy, MIL Lamp on VIN: 1J4FY29P9W
P0171: Fuel System Lean (Bank 1). This vehicle came in running poorly. customer had tried to tune it up new plugs, wires, cap rotor and o2 sensor. checked system and found o2 sensor severly carboned up. replaced o2 sensor. vehicle ran fine all scanner numbers looked fine. returned 2 weeks late...
July 17, 2006
1995 Chevrolet Blazer 4.3L Excessive Emissions, Poor Fuel Economy, MIL Lamp on VIN: 1GNDT13W1S
P0171: lean. Helping out the shop foreman here, and hoping to show him the value of IATN at the same time. We suspect a wiring problem. I read thru the archives and found many emissions problems, but none with these codes. We have inspected the wire harness, and are about ...
July 20, 2006
2003 Ford Ranger XL 2.3L Hesitation, MIL Lamp on VIN: 1FTYR10D33
P0171: system lean. Got this one 2day very low mileage bad hesitation and runs rough off the line seems too clear up some after it gets going... has a lean symptom to it.. Im seeing longterm fuel trim @ 9 or so @ idle and up to 20 going down the road or off idle. It idles ok but ...
July 21, 2006
1999 Volvo V70 2.4L MIL Lamp on VIN: YV1LW55AOX
P0171: Long Term fuel trim low limit. Vehicle failed OBDII emission test. Both codes PO171 and PO455 present. Checked for vac. leaks first. Found usual broken vac. line under intake and repaired. Smoke test EVAP system. No leak found. Manually activated both the purge and vent valves. Both functio...
July 24, 2006
2000 Saturn LS2 3.0L Poor Idle Quality, Hesitation, Stall, Misfire, MIL Lamp on, Lack of Power VIN: 1G8JW52R9Y
P0171: Fuel Trim System Lean (Bank 1). Hello all, I have a Saturn here I'm having some difficulty diagnosing. The customer stated that after replacing the battery, the vehicle bucks and runs rough. The vehicle does run extremely rough, has a noticeable misfire (engine light flashes), stalls occassi...
July 26, 2006
2000 Saturn LS2 3.0L Poor Idle Quality, Hesitation, Stall, Misfire, MIL Lamp on, Lack of Power VIN: 1G8JW52R9Y
P0171: Fuel Trim System Lean (Bank 1). Hello all, I have a Saturn here I'm having some difficulty diagnosing. The customer stated that after replacing the battery, the vehicle bucks and runs rough. The vehicle does run extremely rough, has a noticeable misfire (engine light flashes), stalls occassi...
July 27, 2006