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P0171 Diagnostic Trouble Code Discussion for April 2012

Fuel System Lean (Bank 1)


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Trouble Ticket Help Requests for DTC P0171
Help Request Posted
2000 Toyota Celica GT 1.8L MIL Lamp on VIN: JTDDR32T4Y
P0171: Fuel System Too Lean (Bank 1). 02 b1 s2 runnes at -6.2 at idle. At cruise can go too 26.3 when o2 on plugged still reads -6.2 . When o2 b1 s1 on is plugged goes 0.0 no change at all rpm.
April 04, 2012
2004 Ford Focus SE 2.3L Excessive Emissions, Poor Idle Quality, Poor Fuel Economy, MIL Lamp on, Bogg VIN: 1FAFP34Z54
P0171: Lean bank 1. I have checked the three wires at the tps and fuel rail sensor and at least when i check it all reads normal. 5 volt ref. ground and signal wire. The wiring diagram shows they splice into each other. When this car is cold and codes cleared it runs and drives g...
April 05, 2012
2001 Toyota Corolla CE 1.8L Excessive Emissions, Poor Idle Quality, Hesitation, MIL Lamp on VIN: 2T1BR12E11
P0171: Fuel System Too Lean (Bank 1). ... reoccurring problem. Setting codes P0171 and P0420. The MAF has been replaced with a toyota part. The cat was replaced with 2 aftermarket normal emissions cats, then a california emissions aftermarket cat. The o2 sensors were also...
April 05, 2012
2001 Toyota Corolla CE 1.8L Excessive Emissions, Poor Idle Quality, Hesitation, MIL Lamp on VIN: 2T1BR12E11
P0171: Fuel System Too Lean (Bank 1). ... reoccurring problem. Setting codes P0171 and P0420. The MAF has been replaced with a toyota part. The cat was replaced with 2 aftermarket normal emissions cats, then a california emissions aftermarket cat. The o2 sensors were also...
April 09, 2012
2001 Mazda Protege DX 1.6L Hesitation, Stall VIN: JM1BJ22211
P0171: Adaptive Fuel Trim Too Lean (Bank 1). Hi, this car has me in a pickle. slow acceleration ok until 3000 rpm, then bogs down. fast acceleration and same problem... Fuel pressure ok(has new pump), CMP, TPS, and CKT scopes patterns ok. Mass Air flow sensor ok (have swapped with good one- no change) Ha...
April 10, 2012
2007 Toyota Corolla S 1.8L MIL Lamp on VIN: JTDBR32EX7
P0171: Fuel System Too Lean (Bank 1). ... a p0171.. it does have high fuel trim reads around 17 i did clean the mass air flow sensor and replace the filter with oem but in a week it came back.. do these have problems with the mass air flow sensor or could it be a vacuum leak somewhere i didnt see....
April 11, 2012
2006 Nissan Altima S 2.5L MIL Lamp on VIN: 1N4AL11D86
P0171: Fuel Trim Lean (Bank 1). ... and i'm a euro guy so here it goes. this car was taken to dealer and they put o2 sensors, temp sensors, air mass sensor and nothing seemed to take care of the problem so i got it and it had p0171 code in it and i checked fuel pressure checked short fuel tr...
April 18, 2012
2003 Chevrolet Silverado 2500 HD 6.0L no acceleration VIN: 1GCHK29U53
P0171: Fuel Trim System Lean (Bank 1). Very intermittent. Truck looses power while driving. Can put pedal to floor and does not accelerate. shut off for a few minutes and runs great till next time. could be as long as 2-3 months.Seems like throttle body issue, but have read many sites where techs r...
April 23, 2012
2000 Hyundai Sonata 2.4L Poor Idle Quality, Hesitation
P0171: system too lean bank 1. Put universal flex pipe on. The original flex pipe that was broken 1/2 way off. Car came back 2 days later with po171. It idles rough and has hesitation on acceleration. Smoked engine for leaks (ok)--ect(ok)--checked maf with vantage at idle and 3000 rpm and w...
April 24, 2012
2008 Pontiac G5 2.2L Surge, Stall, MIL Lamp on VIN: 1G2AL18F08
P0171: Lean Bank 1. We can not control purge soleniod with the Scan tool. It 100% or 0%. it will pulse sometimes,Is this a programing issue? We need the purge soleniod to pulse.
April 27, 2012
2000 Toyota Celica GT 1.8L MIL Lamp on VIN: JTDDR32T4Y
P0171: Fuel System Too Lean (Bank 1). 02 b1 s2 runnes at -6.2 at idle. At cruise can go too 26.3 when o2 on plugged still reads -6.2 . When o2 b1 s1 on is plugged goes 0.0 no change at all rpm.
April 04, 2012
2004 Ford Focus SE 2.3L Excessive Emissions, Poor Idle Quality, Poor Fuel Economy, MIL Lamp on, Bogg VIN: 1FAFP34Z54
P0171: Lean bank 1. I have checked the three wires at the tps and fuel rail sensor and at least when i check it all reads normal. 5 volt ref. ground and signal wire. The wiring diagram shows they splice into each other. When this car is cold and codes cleared it runs and drives g...
April 05, 2012
2001 Toyota Corolla CE 1.8L Excessive Emissions, Poor Idle Quality, Hesitation, MIL Lamp on VIN: 2T1BR12E11
P0171: Fuel System Too Lean (Bank 1). ... reoccurring problem. Setting codes P0171 and P0420. The MAF has been replaced with a toyota part. The cat was replaced with 2 aftermarket normal emissions cats, then a california emissions aftermarket cat. The o2 sensors were also...
April 05, 2012
2001 Toyota Corolla CE 1.8L Excessive Emissions, Poor Idle Quality, Hesitation, MIL Lamp on VIN: 2T1BR12E11
P0171: Fuel System Too Lean (Bank 1). ... reoccurring problem. Setting codes P0171 and P0420. The MAF has been replaced with a toyota part. The cat was replaced with 2 aftermarket normal emissions cats, then a california emissions aftermarket cat. The o2 sensors were also...
April 09, 2012
2001 Mazda Protege DX 1.6L Hesitation, Stall VIN: JM1BJ22211
P0171: Adaptive Fuel Trim Too Lean (Bank 1). Hi, this car has me in a pickle. slow acceleration ok until 3000 rpm, then bogs down. fast acceleration and same problem... Fuel pressure ok(has new pump), CMP, TPS, and CKT scopes patterns ok. Mass Air flow sensor ok (have swapped with good one- no change) Ha...
April 10, 2012
2007 Toyota Corolla S 1.8L MIL Lamp on VIN: JTDBR32EX7
P0171: Fuel System Too Lean (Bank 1). ... a p0171.. it does have high fuel trim reads around 17 i did clean the mass air flow sensor and replace the filter with oem but in a week it came back.. do these have problems with the mass air flow sensor or could it be a vacuum leak somewhere i didnt see....
April 11, 2012
2006 Nissan Altima S 2.5L MIL Lamp on VIN: 1N4AL11D86
P0171: Fuel Trim Lean (Bank 1). ... and i'm a euro guy so here it goes. this car was taken to dealer and they put o2 sensors, temp sensors, air mass sensor and nothing seemed to take care of the problem so i got it and it had p0171 code in it and i checked fuel pressure checked short fuel tr...
April 18, 2012
2003 Chevrolet Silverado 2500 HD 6.0L no acceleration VIN: 1GCHK29U53
P0171: Fuel Trim System Lean (Bank 1). Very intermittent. Truck looses power while driving. Can put pedal to floor and does not accelerate. shut off for a few minutes and runs great till next time. could be as long as 2-3 months.Seems like throttle body issue, but have read many sites where techs r...
April 23, 2012
2000 Hyundai Sonata 2.4L Poor Idle Quality, Hesitation
P0171: system too lean bank 1. Put universal flex pipe on. The original flex pipe that was broken 1/2 way off. Car came back 2 days later with po171. It idles rough and has hesitation on acceleration. Smoked engine for leaks (ok)--ect(ok)--checked maf with vantage at idle and 3000 rpm and w...
April 24, 2012
2008 Pontiac G5 2.2L Surge, Stall, MIL Lamp on VIN: 1G2AL18F08
P0171: Lean Bank 1. We can not control purge soleniod with the Scan tool. It 100% or 0%. it will pulse sometimes,Is this a programing issue? We need the purge soleniod to pulse.
April 27, 2012