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P0171 Diagnostic Trouble Code Discussion for August 2010

Fuel System Lean (Bank 1)


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Trouble Ticket Help Requests for DTC P0171
Help Request Posted
1999 Chevrolet Cavalier Z24 2.4L Poor Idle Quality, MIL Lamp on VIN: 4G1JF32T1X
P0171: Fuel System Lean (Bank 1). ... with 2.4L quad 4 motor. Have had poor running for about 1 year now and Secondary Ignition, and 1 new AC Delco injector installed in #3 cylinder at that time with engine running better but I did not like LT fuel of 22-25% and Fuel cell of 25% but it ran bet...
August 02, 2010
2006 Chevrolet Impala LS 3.5L MIL Lamp on VIN: 2G1WB58KX6
P0171: Fuel System Lean. Ok guys, i have this flex-fuel impala, i have verified that the car is e-85 compatiable and i also sell e-85, and i sell a fair amount of e-85 to customers who are putting it in all kinds of flex-fuel vechiles, this is the only one that i have a complaint abou...
August 02, 2010
2002 Audi A6 Quattro 2.7L MIL Lamp on VIN: WAULD64B82
Hello Audi Experts... This car came in a few days ago with the above codes stored in that order. The car was very sluggish...original plugs and low fuel pressure. We replaced the plugs, fuel pressure regulator and air filter element and erased the codes. The ...
August 04, 2010
2002 Saturn Vue 3.0L Cuts out, MIL Lamp on VIN: 5GZCZ63B42
P0171: Fuel Trim System Lean (Bank 1). This car will reset these codes every week to 10 days. The customer says that when it happens the engine jerks and the MIL comes on. It does not stall or has any pattern to it. Then it runs fine but the MIL is on. It is always the same set of codes. When I tes...
August 04, 2010
2004 Ford F-150 FX4 5.4L Surge, Misfire, MIL Lamp on, no power VIN: 1FTPX14584
P0171: System Lean Bank 1. ... We want some advice to make sure the time we spend on this is in the right direction. This truck came in with no power on accel. It feels really doggy even in town(IMHO). When you get out in the country and it shifts into overdrive you can even feel it at ...
August 06, 2010
2006 Ford F-150 XLT 5.4L Hesitation, Surge, Stall, MIL Lamp on, low power VIN: 1FTPW12546
P0171: lean bank 1. Need some assistance on this Ford, First off I would like to say thank you in advance for any help in this problem child. This truck came in with low power on accelation and bucking while driving. There is a what seem to be a valve train tick on the passenger ...
August 07, 2010
2005 Honda Accord DX 2.4L MIL Lamp on, runs lean VIN: 1HGCM56475
P0171: Fuel System Too Lean (Bank 1). car came back and a P0171 set. MAF readings are 2.1 gms/air flow at idle, 37.5 grms at 4600 rpm and going down the road it has 22.35 grms at 30 mph and 60.8 on heavy accel and 72.2grms at hard acell. I fed the engine carb cleaner to watch O2 sensor and it was ...
August 09, 2010
2006 Ford F-150 XLT 5.4L Hesitation, Surge, Stall, MIL Lamp on, low power VIN: 1FTPW12546
P0171: lean bank 1. Need some assistance on this Ford, First off I would like to say thank you in advance for any help in this problem child. This truck came in with low power on accelation and bucking while driving. There is a what seem to be a valve train tick on the passenger ...
August 10, 2010
1998 Toyota 4Runner SR5 3.4L Poor Idle Quality, MIL Lamp on VIN: JT3HN86R6X
P0171: Fuel System Too Lean (Bank 1). Car came to us from another shop. Cel inop but had 4 codes, po100,110,171,120. Found air cleaner plugged and maf very dirty. Replace air filter and cleaned maf. Found tps reading 0% at idle. Replaced tps. Runs ok now but still has high idle cold or hot and som...
August 13, 2010
2000 Toyota Echo 1.5L bank 1 system lean VIN: JTDBY1235Y
P0171: Fuel System Too Lean (Bank 1). performed a basic tune up and engine light was not pressent light came on a few days latter after that.cleaned maf sensor and throttle body.If any body can help i would realy appreciate it.
August 13, 2010
2001 Nissan Sentra XE 1.8L Hesitation, Surge, MIL Lamp on VIN: 3N1CB51D01
P0171: Fuel Trim Lean. origenaly car ran fine untill stalled in trafic,restarted after sitting for 10 min.s check engine light came on after driving home. next day engine cranks over but no start. another shop c/o crank and speedo sensors. now we get car with engine hesitating at cr...
August 14, 2010
2004 Audi A4 Cabriolet 1.8L MIL Lamp on VIN: WAUAC48H24
P0171: bank 1 lean. ... mixture & loss of boost between turbo & throttle body. short term fuel trim was fixed at 25%. smoked intake, found leaking diverter(?) valve on back of valve cover. replaced valve, no more code for boost loss but still getting code p0171. short ter...
August 17, 2010
2004 Ford F-150 Heritage XLT 4.6L MIL Lamp on VIN: 2FTKF08W34
P0171: Bank 1 system lean. ... on p0171 and p0174 bank 1 and 2 system lean. Found vacuum leak and replace that vacuum line. After repair i drove vehicle for 15 minutes and then let sit outside running for another 30 minutes, check engine light didnt come back on. Customer picked vehicle...
August 21, 2010
2005 Ford Mustang GT 4.6L MIL Lamp on VIN: 1ZVHT82H75
P0171: lean bank1. ... bcm issues (delt with) aftermarket programmer removed stock/latest reflash, aftermarket alarm removed ,old lojack removed,smoke tested intake with pcvand vent plugged no leaks detected,replaced fuel filter-some dirt-not plugged-2 motorcraft maf,frp reads a...
August 21, 2010
1996 GMC Yukon SL 5.7L Poor Idle Quality, MIL Lamp on VIN: 3GKEK18R9T
P0171: Fuel Trim System Lean (Bank 1). vehicle came in for intermittant extented crank. tech installed delphi fuel pump, filter, sending unit, regulator, intake. that fixed the extended crank. vehicle came back for fuel smell. tank was leaking. replaced fuel tank. vehicle came back for check engine...
August 21, 2010
1998 Ford Explorer XL 4.0L MIL Lamp on VIN: 1FMZU32X5W
P0171: Lean bank 1. ... found P0171 & P0174 lean bank 1 & 2. When I smoke the engine,smoke agressively comes from the rear of the oil pan, like where you would put some sealer during installation. The short term fuel counts are both @ 38. ...
August 24, 2010
2005 Ford Mustang GT 4.6L MIL Lamp on VIN: 1ZVHT82H75
P0171: lean bank1. ... bcm issues (delt with) aftermarket programmer removed stock/latest reflash, aftermarket alarm removed ,old lojack removed,smoke tested intake with pcvand vent plugged no leaks detected,replaced fuel filter-some dirt-not plugged-2 motorcraft maf,frp reads a...
August 25, 2010
2006 Ford F-150 FX4 5.4L MIL Lamp on VIN: 1FTPW14556
P0171: Lean bank one. ... light. P0171 p0174 lean both banks. Engine has aftermarket aem cold air intake. Customer claims it has been on since new without a problem. My long term fuel trims are maxed out +25. I have installed a fuel pressure gauge inline and it is within specs. I s...
August 25, 2010
2004 Cadillac DeVille 4.6L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1G6KD54Y44
P0171: Fuel Trim System Lean (Bank 1). OK so SES light is on & off sporadically for past couple of weeks. Strangely enough it passed Maryland State Emissions Testing just a few weeks ago. I do not have a Gas analyzer sorry for that, I know it would be helpful to know what the gases are doing. (...
August 26, 2010
2004 Cadillac DeVille 4.6L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1G6KD54Y44
P0171: Fuel Trim System Lean (Bank 1). OK so SES light is on & off sporadically for past couple of weeks. Strangely enough it passed Maryland State Emissions Testing just a few weeks ago. I do not have a Gas analyzer sorry for that, I know it would be helpful to know what the gases are doing. (...
August 28, 2010
2000 Chevrolet Express 1500 4.3L MIL Lamp on VIN: 1GBFG15W6Y
P0171: Fuel Trim System Lean (Bank 1). hello fellow technicians. truck came in for misfire. found 4 codes listed. also i dont understand why i have a a.i.r code, this truck has no a.i.r system. atleast no relay, fuse or pump. well anyways wires were arcing and plugs were .030 worn over gap. replace...
August 30, 2010
1999 Chevrolet Cavalier Z24 2.4L Poor Idle Quality, MIL Lamp on VIN: 4G1JF32T1X
P0171: Fuel System Lean (Bank 1). ... with 2.4L quad 4 motor. Have had poor running for about 1 year now and Secondary Ignition, and 1 new AC Delco injector installed in #3 cylinder at that time with engine running better but I did not like LT fuel of 22-25% and Fuel cell of 25% but it ran bet...
August 02, 2010
2006 Chevrolet Impala LS 3.5L MIL Lamp on VIN: 2G1WB58KX6
P0171: Fuel System Lean. Ok guys, i have this flex-fuel impala, i have verified that the car is e-85 compatiable and i also sell e-85, and i sell a fair amount of e-85 to customers who are putting it in all kinds of flex-fuel vechiles, this is the only one that i have a complaint abou...
August 02, 2010
2002 Audi A6 Quattro 2.7L MIL Lamp on VIN: WAULD64B82
Hello Audi Experts... This car came in a few days ago with the above codes stored in that order. The car was very sluggish...original plugs and low fuel pressure. We replaced the plugs, fuel pressure regulator and air filter element and erased the codes. The ...
August 04, 2010
2002 Saturn Vue 3.0L Cuts out, MIL Lamp on VIN: 5GZCZ63B42
P0171: Fuel Trim System Lean (Bank 1). This car will reset these codes every week to 10 days. The customer says that when it happens the engine jerks and the MIL comes on. It does not stall or has any pattern to it. Then it runs fine but the MIL is on. It is always the same set of codes. When I tes...
August 04, 2010
2004 Ford F-150 FX4 5.4L Surge, Misfire, MIL Lamp on, no power VIN: 1FTPX14584
P0171: System Lean Bank 1. ... We want some advice to make sure the time we spend on this is in the right direction. This truck came in with no power on accel. It feels really doggy even in town(IMHO). When you get out in the country and it shifts into overdrive you can even feel it at ...
August 06, 2010
2006 Ford F-150 XLT 5.4L Hesitation, Surge, Stall, MIL Lamp on, low power VIN: 1FTPW12546
P0171: lean bank 1. Need some assistance on this Ford, First off I would like to say thank you in advance for any help in this problem child. This truck came in with low power on accelation and bucking while driving. There is a what seem to be a valve train tick on the passenger ...
August 07, 2010
2005 Honda Accord DX 2.4L MIL Lamp on, runs lean VIN: 1HGCM56475
P0171: Fuel System Too Lean (Bank 1). car came back and a P0171 set. MAF readings are 2.1 gms/air flow at idle, 37.5 grms at 4600 rpm and going down the road it has 22.35 grms at 30 mph and 60.8 on heavy accel and 72.2grms at hard acell. I fed the engine carb cleaner to watch O2 sensor and it was ...
August 09, 2010
2006 Ford F-150 XLT 5.4L Hesitation, Surge, Stall, MIL Lamp on, low power VIN: 1FTPW12546
P0171: lean bank 1. Need some assistance on this Ford, First off I would like to say thank you in advance for any help in this problem child. This truck came in with low power on accelation and bucking while driving. There is a what seem to be a valve train tick on the passenger ...
August 10, 2010
1998 Toyota 4Runner SR5 3.4L Poor Idle Quality, MIL Lamp on VIN: JT3HN86R6X
P0171: Fuel System Too Lean (Bank 1). Car came to us from another shop. Cel inop but had 4 codes, po100,110,171,120. Found air cleaner plugged and maf very dirty. Replace air filter and cleaned maf. Found tps reading 0% at idle. Replaced tps. Runs ok now but still has high idle cold or hot and som...
August 13, 2010
2000 Toyota Echo 1.5L bank 1 system lean VIN: JTDBY1235Y
P0171: Fuel System Too Lean (Bank 1). performed a basic tune up and engine light was not pressent light came on a few days latter after that.cleaned maf sensor and throttle body.If any body can help i would realy appreciate it.
August 13, 2010
2001 Nissan Sentra XE 1.8L Hesitation, Surge, MIL Lamp on VIN: 3N1CB51D01
P0171: Fuel Trim Lean. origenaly car ran fine untill stalled in trafic,restarted after sitting for 10 min.s check engine light came on after driving home. next day engine cranks over but no start. another shop c/o crank and speedo sensors. now we get car with engine hesitating at cr...
August 14, 2010
2004 Audi A4 Cabriolet 1.8L MIL Lamp on VIN: WAUAC48H24
P0171: bank 1 lean. ... mixture & loss of boost between turbo & throttle body. short term fuel trim was fixed at 25%. smoked intake, found leaking diverter(?) valve on back of valve cover. replaced valve, no more code for boost loss but still getting code p0171. short ter...
August 17, 2010
2004 Ford F-150 Heritage XLT 4.6L MIL Lamp on VIN: 2FTKF08W34
P0171: Bank 1 system lean. ... on p0171 and p0174 bank 1 and 2 system lean. Found vacuum leak and replace that vacuum line. After repair i drove vehicle for 15 minutes and then let sit outside running for another 30 minutes, check engine light didnt come back on. Customer picked vehicle...
August 21, 2010
2005 Ford Mustang GT 4.6L MIL Lamp on VIN: 1ZVHT82H75
P0171: lean bank1. ... bcm issues (delt with) aftermarket programmer removed stock/latest reflash, aftermarket alarm removed ,old lojack removed,smoke tested intake with pcvand vent plugged no leaks detected,replaced fuel filter-some dirt-not plugged-2 motorcraft maf,frp reads a...
August 21, 2010
1996 GMC Yukon SL 5.7L Poor Idle Quality, MIL Lamp on VIN: 3GKEK18R9T
P0171: Fuel Trim System Lean (Bank 1). vehicle came in for intermittant extented crank. tech installed delphi fuel pump, filter, sending unit, regulator, intake. that fixed the extended crank. vehicle came back for fuel smell. tank was leaking. replaced fuel tank. vehicle came back for check engine...
August 21, 2010
1998 Ford Explorer XL 4.0L MIL Lamp on VIN: 1FMZU32X5W
P0171: Lean bank 1. ... found P0171 & P0174 lean bank 1 & 2. When I smoke the engine,smoke agressively comes from the rear of the oil pan, like where you would put some sealer during installation. The short term fuel counts are both @ 38. ...
August 24, 2010
2005 Ford Mustang GT 4.6L MIL Lamp on VIN: 1ZVHT82H75
P0171: lean bank1. ... bcm issues (delt with) aftermarket programmer removed stock/latest reflash, aftermarket alarm removed ,old lojack removed,smoke tested intake with pcvand vent plugged no leaks detected,replaced fuel filter-some dirt-not plugged-2 motorcraft maf,frp reads a...
August 25, 2010
2006 Ford F-150 FX4 5.4L MIL Lamp on VIN: 1FTPW14556
P0171: Lean bank one. ... light. P0171 p0174 lean both banks. Engine has aftermarket aem cold air intake. Customer claims it has been on since new without a problem. My long term fuel trims are maxed out +25. I have installed a fuel pressure gauge inline and it is within specs. I s...
August 25, 2010
2004 Cadillac DeVille 4.6L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1G6KD54Y44
P0171: Fuel Trim System Lean (Bank 1). OK so SES light is on & off sporadically for past couple of weeks. Strangely enough it passed Maryland State Emissions Testing just a few weeks ago. I do not have a Gas analyzer sorry for that, I know it would be helpful to know what the gases are doing. (...
August 26, 2010
2004 Cadillac DeVille 4.6L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1G6KD54Y44
P0171: Fuel Trim System Lean (Bank 1). OK so SES light is on & off sporadically for past couple of weeks. Strangely enough it passed Maryland State Emissions Testing just a few weeks ago. I do not have a Gas analyzer sorry for that, I know it would be helpful to know what the gases are doing. (...
August 28, 2010
2000 Chevrolet Express 1500 4.3L MIL Lamp on VIN: 1GBFG15W6Y
P0171: Fuel Trim System Lean (Bank 1). hello fellow technicians. truck came in for misfire. found 4 codes listed. also i dont understand why i have a a.i.r code, this truck has no a.i.r system. atleast no relay, fuse or pump. well anyways wires were arcing and plugs were .030 worn over gap. replace...
August 30, 2010