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P0171 Diagnostic Trouble Code Discussion for October 2011

Fuel System Lean (Bank 1)


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Trouble Ticket Help Requests for DTC P0171
Help Request Posted
1999 Ford F-150 5.4L Poor Idle Quality, Surge, Stall, MIL Lamp on VIN: 2FTRX18COX
P0171: bank 1 lean. ... dying at stops. After intake gasket repalcement the only dtcs to come back were p1131 and p1151 o2 indicates lean with p0401 egr insufficant flow. Before gasket replacement it was p0171 a...
October 03, 2011
2005 Ford Taurus SE 3.0L Surge, Stall VIN: 1FAFP53U95
Grab a cup of coffee, this may take a while... This new customer comes in with the engine barely running. Her brother replaced spark plugs. After smoking the engine we found the o-ring for the air diverter motor was hard and causing a major vacuum leak. Replac...
October 05, 2011
2007 Toyota Camry LE 2.4L Poor Idle Quality, MIL Lamp on VIN: 4T1BE46K67
P0171: Fuel System Too Lean (Bank 1). Good morning techs, This vehicle has me baffled. I replaced MAF per instructions with scanner. This did not help. Tried A/F ratio sensor next. Problem not resolved. Called a friend he says intake leak. (Toyota tech) Check for leaks all around intake no change...
October 08, 2011
2004 Ford F-150 Heritage XL 4.2L Poor Fuel Economy VIN: 2FTRF172XC
P0171: system bank 1 lean. hi guys need help. have been furiously working on trying to get short term fueltrims to go below 33% at idle and 24%long term while driving. as stated above in repair history, all the normal repairs have been done. and no i have not just been throwing parts at...
October 10, 2011
1997 Chevrolet Express 1500 5.7L Hesitation, MIL Lamp on VIN: 1GBFG15RXV
P0171: Fuel Trim System Lean (Bank 1). Came in for check engine light.customer was out of town when the light came on.it was diagnosed as needing fuel pressure regulator.after repairs light came back on within 20 miles so customer drove it home and here it is.fuel pressure running is at 49 psi 58 k...
October 11, 2011
2004 Suzuki Verona S 2.5L Poor Idle Quality, Cuts out, MIL Lamp on VIN: KL5VM52L34
P0171: Fuel System Too Lean (Bank 1). Thank you for any help with this. And yes all of those codes were stored when it came in. Ok it came in for a jerking/bucking. when driving if you drive below 10 mph car would stall but start back up. Finally the dash and tail lights are not working... Ok figu...
October 11, 2011
2000 Saab 9-3 SE 2.0L Poor Idle Quality, MIL Lamp on VIN: HIY2023888
P0171: system lean bank 1. Replaced plugs to correct P1312. The P0171 reoccured along with P1654 fuel pump relay intermittant coil circut. No obvoius leaks, checked intake gasket with ether. There is some idle speed increase using propane in the intake hose but too much stalls it, respe...
October 12, 2011
2004 Suzuki Verona S 2.5L Poor Idle Quality, Cuts out, MIL Lamp on VIN: KL5VM52L34
P0171: Fuel System Too Lean (Bank 1). Thank you for any help with this. And yes all of those codes were stored when it came in. Ok it came in for a jerking/bucking. when driving if you drive below 10 mph car would stall but start back up. Finally the dash and tail lights are not working... Ok figu...
October 12, 2011
1997 Chevrolet Express 1500 5.7L Hesitation, MIL Lamp on VIN: 1GBFG15RXV
P0171: Fuel Trim System Lean (Bank 1). Came in for check engine light.customer was out of town when the light came on.it was diagnosed as needing fuel pressure regulator.after repairs light came back on within 20 miles so customer drove it home and here it is.fuel pressure running is at 49 psi 58 k...
October 17, 2011
2003 Volkswagen Passat GLS 1.8L Poor Idle Quality, Misfire, MIL Lamp on VIN: WVWMD63823
P0171: Lean Bank 1 - comes up twice. Customer brought car in with complaint of running poorly, almost shutting off and flashing check engine light. I pulled the codes and with the 0171 and misfires on all cylinders, I sort of ruled out one or two bad coils. It also had code 0507 but there wasn't...
October 17, 2011
2006 Ford Fusion SEL 3.0L MIL Lamp on, VIN: 3FAHP08106
P0171: Bank 1 lean. Car has an intermitten codes of banks 1 and 2 lean. Vehicle codes can be cleared and it may come back a few minuets later (at idle) or during a drive (50 plus miles or so). I have checked for Vacuum leaks and found none. MAF sensor is good and been replaced. ...
October 18, 2011
2006 Land Rover Range Rover HSE 4.4L MIL Lamp on VIN: SALME15436
P0171: lean bank 1. Cannot find a vacum leak eventhough it sounds like there is one . People say that the cat's crack sometimes but this is not the case, did check fuel trims they seem to be around zero most of the time. I know that the brake vacum pump is not working, however i ...
October 19, 2011
2003 BMW M5 5.0L Poor Idle Quality, Surge, Misfire VIN: WBSDE93403
P0171: Alternating from bank to bank during different key cylces. Have spent numerous hours chasing this problem
October 21, 2011
2006 Ford Fusion SEL 3.0L MIL Lamp on, VIN: 3FAHP08106
P0171: Bank 1 lean. Car has an intermitten codes of banks 1 and 2 lean. Vehicle codes can be cleared and it may come back a few minuets later (at idle) or during a drive (50 plus miles or so). I have checked for Vacuum leaks and found none. MAF sensor is good and been replaced. ...
October 23, 2011
2000 Chevrolet S10 4.3L MIL Lamp on VIN: 1GCDT14WXY
P0171: Fuel System Lean. Hey guys, this S-10 came into the shop last week running really bad under a load. It would sputter and backfire and had no power. Another tech in the shop replaced the fuel pump because the pressure was way under spec, and the problem was still there. He then ...
October 24, 2011
2001 Ford Explorer Sport 4.0L MIL Lamp on VIN: 1FMYU70E71
P0171: lean bank 1. Thanks in advance for any input. I have this headache on my hands. I had this one come in for check engine light. I pulled codes and found lean codes. I checked for major vacuum leaks and found nothing. I have seen several of these with intake gaskets brittle ...
October 26, 2011
1996 Acura Integra Special Edition 1.8L Cuts out VIN: JH4DC4365T
P0171: Fuel System Too Lean (Bank 1). This one is a real tough one. Very intermittently on acceleration this car will lose power as though there is a lack of fuel. It happens for about 2 seconds and then the acceleration picks up again as though nothing was wrong. It had come in with 2 lean codes ...
October 28, 2011
2004 Volkswagen Jetta GL 1.8L Hesitation, Stall, MIL Lamp on VIN: 3VWRE69M54
P0171: Angle sender 2 for throttle valve Implausible signal. VWs Ugh! This car has an intermittent problem. I put 80 miles on it the other day and no problem. I have been able to recreate the problem several times. When it happens, the car will stall. The check engine and EPC light come on. It will have a host of implau...
October 29, 2011
2006 Chevrolet Uplander LT 3.5L MIL Lamp on VIN: 1GNDV33L36
P0171: Fuel System Lean. hey guys this vehicle came in chugging and bucking sometimes and the mil on with code po171 in it.my tech look it over found an erratic mass air flow sensor input,5.23 volts at idle 580 to 600 rpms,sometimes it would come down to where it needed to be 3.56 to ...
October 30, 2011
2005 Jaguar X-Type 3.0L MIL Lamp on VIN: SAJWA51C05
P0171: lean bank one. ... time. I have this 05 Jaguar with a P0171 and P0174. When the vehicle first arrived it only had one code, P0174 lean bank two. We started with looking at the data and saw @ idle LFT B2=+19 B1=+10.9, when accelarating LFT B2 would drop to +14.6 and B1 would ...
October 30, 2011
1999 Ford F-150 5.4L Poor Idle Quality, Surge, Stall, MIL Lamp on VIN: 2FTRX18COX
P0171: bank 1 lean. ... dying at stops. After intake gasket repalcement the only dtcs to come back were p1131 and p1151 o2 indicates lean with p0401 egr insufficant flow. Before gasket replacement it was p0171 a...
October 03, 2011
2005 Ford Taurus SE 3.0L Surge, Stall VIN: 1FAFP53U95
Grab a cup of coffee, this may take a while... This new customer comes in with the engine barely running. Her brother replaced spark plugs. After smoking the engine we found the o-ring for the air diverter motor was hard and causing a major vacuum leak. Replac...
October 05, 2011
2007 Toyota Camry LE 2.4L Poor Idle Quality, MIL Lamp on VIN: 4T1BE46K67
P0171: Fuel System Too Lean (Bank 1). Good morning techs, This vehicle has me baffled. I replaced MAF per instructions with scanner. This did not help. Tried A/F ratio sensor next. Problem not resolved. Called a friend he says intake leak. (Toyota tech) Check for leaks all around intake no change...
October 08, 2011
2004 Ford F-150 Heritage XL 4.2L Poor Fuel Economy VIN: 2FTRF172XC
P0171: system bank 1 lean. hi guys need help. have been furiously working on trying to get short term fueltrims to go below 33% at idle and 24%long term while driving. as stated above in repair history, all the normal repairs have been done. and no i have not just been throwing parts at...
October 10, 2011
1997 Chevrolet Express 1500 5.7L Hesitation, MIL Lamp on VIN: 1GBFG15RXV
P0171: Fuel Trim System Lean (Bank 1). Came in for check engine light.customer was out of town when the light came on.it was diagnosed as needing fuel pressure regulator.after repairs light came back on within 20 miles so customer drove it home and here it is.fuel pressure running is at 49 psi 58 k...
October 11, 2011
2004 Suzuki Verona S 2.5L Poor Idle Quality, Cuts out, MIL Lamp on VIN: KL5VM52L34
P0171: Fuel System Too Lean (Bank 1). Thank you for any help with this. And yes all of those codes were stored when it came in. Ok it came in for a jerking/bucking. when driving if you drive below 10 mph car would stall but start back up. Finally the dash and tail lights are not working... Ok figu...
October 11, 2011
2000 Saab 9-3 SE 2.0L Poor Idle Quality, MIL Lamp on VIN: HIY2023888
P0171: system lean bank 1. Replaced plugs to correct P1312. The P0171 reoccured along with P1654 fuel pump relay intermittant coil circut. No obvoius leaks, checked intake gasket with ether. There is some idle speed increase using propane in the intake hose but too much stalls it, respe...
October 12, 2011
2004 Suzuki Verona S 2.5L Poor Idle Quality, Cuts out, MIL Lamp on VIN: KL5VM52L34
P0171: Fuel System Too Lean (Bank 1). Thank you for any help with this. And yes all of those codes were stored when it came in. Ok it came in for a jerking/bucking. when driving if you drive below 10 mph car would stall but start back up. Finally the dash and tail lights are not working... Ok figu...
October 12, 2011
1997 Chevrolet Express 1500 5.7L Hesitation, MIL Lamp on VIN: 1GBFG15RXV
P0171: Fuel Trim System Lean (Bank 1). Came in for check engine light.customer was out of town when the light came on.it was diagnosed as needing fuel pressure regulator.after repairs light came back on within 20 miles so customer drove it home and here it is.fuel pressure running is at 49 psi 58 k...
October 17, 2011
2003 Volkswagen Passat GLS 1.8L Poor Idle Quality, Misfire, MIL Lamp on VIN: WVWMD63823
P0171: Lean Bank 1 - comes up twice. Customer brought car in with complaint of running poorly, almost shutting off and flashing check engine light. I pulled the codes and with the 0171 and misfires on all cylinders, I sort of ruled out one or two bad coils. It also had code 0507 but there wasn't...
October 17, 2011
2006 Ford Fusion SEL 3.0L MIL Lamp on, VIN: 3FAHP08106
P0171: Bank 1 lean. Car has an intermitten codes of banks 1 and 2 lean. Vehicle codes can be cleared and it may come back a few minuets later (at idle) or during a drive (50 plus miles or so). I have checked for Vacuum leaks and found none. MAF sensor is good and been replaced. ...
October 18, 2011
2006 Land Rover Range Rover HSE 4.4L MIL Lamp on VIN: SALME15436
P0171: lean bank 1. Cannot find a vacum leak eventhough it sounds like there is one . People say that the cat's crack sometimes but this is not the case, did check fuel trims they seem to be around zero most of the time. I know that the brake vacum pump is not working, however i ...
October 19, 2011
2003 BMW M5 5.0L Poor Idle Quality, Surge, Misfire VIN: WBSDE93403
P0171: Alternating from bank to bank during different key cylces. Have spent numerous hours chasing this problem
October 21, 2011
2006 Ford Fusion SEL 3.0L MIL Lamp on, VIN: 3FAHP08106
P0171: Bank 1 lean. Car has an intermitten codes of banks 1 and 2 lean. Vehicle codes can be cleared and it may come back a few minuets later (at idle) or during a drive (50 plus miles or so). I have checked for Vacuum leaks and found none. MAF sensor is good and been replaced. ...
October 23, 2011
2000 Chevrolet S10 4.3L MIL Lamp on VIN: 1GCDT14WXY
P0171: Fuel System Lean. Hey guys, this S-10 came into the shop last week running really bad under a load. It would sputter and backfire and had no power. Another tech in the shop replaced the fuel pump because the pressure was way under spec, and the problem was still there. He then ...
October 24, 2011
2001 Ford Explorer Sport 4.0L MIL Lamp on VIN: 1FMYU70E71
P0171: lean bank 1. Thanks in advance for any input. I have this headache on my hands. I had this one come in for check engine light. I pulled codes and found lean codes. I checked for major vacuum leaks and found nothing. I have seen several of these with intake gaskets brittle ...
October 26, 2011
1996 Acura Integra Special Edition 1.8L Cuts out VIN: JH4DC4365T
P0171: Fuel System Too Lean (Bank 1). This one is a real tough one. Very intermittently on acceleration this car will lose power as though there is a lack of fuel. It happens for about 2 seconds and then the acceleration picks up again as though nothing was wrong. It had come in with 2 lean codes ...
October 28, 2011
2004 Volkswagen Jetta GL 1.8L Hesitation, Stall, MIL Lamp on VIN: 3VWRE69M54
P0171: Angle sender 2 for throttle valve Implausible signal. VWs Ugh! This car has an intermittent problem. I put 80 miles on it the other day and no problem. I have been able to recreate the problem several times. When it happens, the car will stall. The check engine and EPC light come on. It will have a host of implau...
October 29, 2011
2006 Chevrolet Uplander LT 3.5L MIL Lamp on VIN: 1GNDV33L36
P0171: Fuel System Lean. hey guys this vehicle came in chugging and bucking sometimes and the mil on with code po171 in it.my tech look it over found an erratic mass air flow sensor input,5.23 volts at idle 580 to 600 rpms,sometimes it would come down to where it needed to be 3.56 to ...
October 30, 2011
2005 Jaguar X-Type 3.0L MIL Lamp on VIN: SAJWA51C05
P0171: lean bank one. ... time. I have this 05 Jaguar with a P0171 and P0174. When the vehicle first arrived it only had one code, P0174 lean bank two. We started with looking at the data and saw @ idle LFT B2=+19 B1=+10.9, when accelarating LFT B2 would drop to +14.6 and B1 would ...
October 30, 2011