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P0171 Diagnostic Trouble Code Discussion for February 2014

Fuel System Lean (Bank 1)


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Trouble Ticket Help Requests for DTC P0171
Help Request Posted
2002 GMC Yukon XL 1500 SLE 5.3L Misfire, MIL Lamp on VIN: 1GKFK16T52
P0171: Fuel Trim System Lean (Bank 1). All tune up parts including fuel filter look new and in good condition. It only has misfire on multiple cylinders on fist startup of the day, runs good after warms up. On cold start the short term trims on both cylinders was about 30. After it warms up the sho...
February 05, 2014
2003 Toyota Corolla CE 1.8L MIL Lamp on VIN: 2T1BR32E53
P0171: Fuel System Too Lean (Bank 1). ... light with code P0171 - Fuel trim too lean. Visual inspection and smoke test cannot find any vacuum leak. Road test to determine if MAF at fault but all data reading look ok other than fuel trim. Short term fuel trim reading are 7% and long term at around ...
February 07, 2014
1999 Mazda B4000 SE 4.0L Poor Idle Quality, Hesitation, Cuts out, Misfire, MIL Lamp on VIN: 4F4ZR17X6X
P0171: Adaptive Fuel Trim Too Lean (Bank 1). First, all data readings are at idle. Symptom is intermittent and will happen at idle and/or cruising. Customer complained of always running rough while cold, and now it runs rough with no power intermittently hot along with the rough cold idle. Related histor...
February 10, 2014
2003 Toyota Corolla CE 1.8L MIL Lamp on VIN: 2T1BR32E53
P0171: Fuel System Too Lean (Bank 1). ... light with code P0171 - Fuel trim too lean. Visual inspection and smoke test cannot find any vacuum leak. Road test to determine if MAF at fault but all data reading look ok other than fuel trim. Short term fuel trim reading are 7% and long term at around ...
February 10, 2014
1999 Ford Ranger XLT 4.0L MIL Lamp on VIN: 1FTZR15X1X
P0171: Lean Bank 1. ... issues. Scan showed P0171 & P0174 codes. Smoked engine and found bad upper intake gaskets. Replaced gaskets and re-smoked. No new smoke evident. Cleared codes and road tested. After 2 drive cycles P0171 & P0174 returned. The LT Fuel trims were at 2...
February 11, 2014
1999 Mazda B4000 SE 4.0L Poor Idle Quality, Hesitation, Cuts out, Misfire, MIL Lamp on VIN: 4F4ZR17X6X
P0171: Adaptive Fuel Trim Too Lean (Bank 1). First, all data readings are at idle. Symptom is intermittent and will happen at idle and/or cruising. Customer complained of always running rough while cold, and now it runs rough with no power intermittently hot along with the rough cold idle. Related histor...
February 11, 2014
2005 Acura TL 3.2L MIL Lamp on VIN: 19UUA65655
P0171: Fuel System Too Lean (Bank 1). ... insane. Car came in 2 weeks ago with P0171 and P0174, at the time didn't have much time to check it, so just cleared the codes and asked customer to bring it back if MIL returned, well its here. Its a MAP system, no MAF. Vehicle at idle has LT trims aroun...
February 12, 2014
2003 Ford Taurus LX 3.0L Hesitation, Cuts out, Misfire, MIL Lamp on VIN: 1FAFP55283
P0171: System to lean Bank 1. ... crasy,when it came to the shop i had all the code above PO316 PO302 PO174 PO171, Also PO741 I service the Transmission and replace the Filter wish was real bad, the code came back, i call the Customer and he say not to worry about it, just get the Engine n...
February 14, 2014
2006 Chevrolet Impala LTZ 3.9L MIL Lamp on VIN: 2G1WU58106
P0171: Fuel System Lean. We have this car keeps setting code po171 lean bank1 smoked test engine for vaccum leaks none found fuel pressure is 70 psi.o2 sensor is swithching.i tested mass air flow sensor looked ok but with mileage i decided to install one but no luck.road testing the c...
February 20, 2014
2005 Land Rover LR3 SE 4.4L Hesitation, MIL Lamp on VIN: SALAA25495
P0171: lean bank one. ... here. Out of town customer stopped in at closing last night with car load of kids and dogs vehicle driven on highway for 1.5 hours then attempted to go up ski hill no power and checklight came on. Scanned codes p0171 and p0174 lean banks one and two. Also ...
February 21, 2014
2001 Ford Windstar LX 3.8L Poor Idle Quality, Hesitation, Stall, MIL Lamp on VIN: 2FMZA51411
P0171: fuel trim lean bk 1. ... have little prior history on it except the customer stated the spark plugs have been replaced many times due to fouling. On initial scan p0171,p0174 fuel trim lean codes were present. short term and long term fuel trims maxed out +25. Found vacuum line to ...
February 22, 2014
2000 Toyota Corolla VE 1.8L MIL Lamp on, P0171, New MAF VIN: 1NXBR12E2Y
P0171: Fuel System Too Lean (Bank 1). Fuel trims initially high, idle and cruise over 30% combined, with hesitation and power loss. Good fuel pressure, no intake metered air leaks, and no vacuum leaks detected with propane or smoke. Calculated Load at WOT snaps in bay and VE tests at max RPM on th...
February 24, 2014
2007 Toyota RAV4 2.4L Cuts out, Stall, Misfire, hard start VIN: JTMZD33V77
P0171: Fuel System Too Lean (Bank 1). So far, I have run into a wall on this vehicle. Car has a po171, and cold it is a very extended crank, upwards of 30-45 seconds. Did notice a stumble/misfire when first started cold but that cleared up within 10 seconds and could not duplicate it. Fuel trims ...
February 25, 2014
2001 Toyota Corolla CE 1.8L MIL Lamp on VIN: 1NXBR12E21
P0171: Fuel System Too Lean (Bank 1). I have this corolla giving me a hard time if i watch my fuel trims they bounch around sometimes at 2500 rpm from -20 to plus 20 for no reason then i get a fuel trim malfunction code i changed the maf sensor got rid of the po 171 code but this thing runs great ...
February 26, 2014
2006 Volkswagen Jetta GLI 2.0L MIL Lamp on VIN: 3VWXJ71K56
P0171: system lean. ... 2.0 turbo? It came in with no drivability complaints but had a p0171 lean code. I've replaced plenty of valve covers on the 2.5 for this, so the first thing I did was pulled the dipstick. When I did, the engine started to stumble and I found obvious vacuum...
February 27, 2014
2006 Volkswagen Jetta GLI 2.0L MIL Lamp on VIN: 3VWXJ71K56
P0171: system lean. ... 2.0 turbo? It came in with no drivability complaints but had a p0171 lean code. I've replaced plenty of valve covers on the 2.5 for this, so the first thing I did was pulled the dipstick. When I did, the engine started to stumble and I found obvious vacuum...
February 28, 2014
2003 Toyota Corolla CE 1.8L MIL Lamp on VIN: 2T1BR32E53
P0171: Fuel System Too Lean (Bank 1). ... light with code P0171 - Fuel trim too lean. Visual inspection and smoke test cannot find any vacuum leak. Road test to determine if MAF at fault but all data reading look ok other than fuel trim. Short term fuel trim reading are 7% and long term at around ...
February 07, 2014
1999 Mazda B4000 SE 4.0L Poor Idle Quality, Hesitation, Cuts out, Misfire, MIL Lamp on VIN: 4F4ZR17X6X
P0171: Adaptive Fuel Trim Too Lean (Bank 1). First, all data readings are at idle. Symptom is intermittent and will happen at idle and/or cruising. Customer complained of always running rough while cold, and now it runs rough with no power intermittently hot along with the rough cold idle. Related histor...
February 10, 2014
2003 Toyota Corolla CE 1.8L MIL Lamp on VIN: 2T1BR32E53
P0171: Fuel System Too Lean (Bank 1). ... light with code P0171 - Fuel trim too lean. Visual inspection and smoke test cannot find any vacuum leak. Road test to determine if MAF at fault but all data reading look ok other than fuel trim. Short term fuel trim reading are 7% and long term at around ...
February 10, 2014
1999 Ford Ranger XLT 4.0L MIL Lamp on VIN: 1FTZR15X1X
P0171: Lean Bank 1. ... issues. Scan showed P0171 & P0174 codes. Smoked engine and found bad upper intake gaskets. Replaced gaskets and re-smoked. No new smoke evident. Cleared codes and road tested. After 2 drive cycles P0171 & P0174 returned. The LT Fuel trims were at 2...
February 11, 2014
1999 Mazda B4000 SE 4.0L Poor Idle Quality, Hesitation, Cuts out, Misfire, MIL Lamp on VIN: 4F4ZR17X6X
P0171: Adaptive Fuel Trim Too Lean (Bank 1). First, all data readings are at idle. Symptom is intermittent and will happen at idle and/or cruising. Customer complained of always running rough while cold, and now it runs rough with no power intermittently hot along with the rough cold idle. Related histor...
February 11, 2014
2005 Acura TL 3.2L MIL Lamp on VIN: 19UUA65655
P0171: Fuel System Too Lean (Bank 1). ... insane. Car came in 2 weeks ago with P0171 and P0174, at the time didn't have much time to check it, so just cleared the codes and asked customer to bring it back if MIL returned, well its here. Its a MAP system, no MAF. Vehicle at idle has LT trims aroun...
February 12, 2014
2003 Ford Taurus LX 3.0L Hesitation, Cuts out, Misfire, MIL Lamp on VIN: 1FAFP55283
P0171: System to lean Bank 1. ... crasy,when it came to the shop i had all the code above PO316 PO302 PO174 PO171, Also PO741 I service the Transmission and replace the Filter wish was real bad, the code came back, i call the Customer and he say not to worry about it, just get the Engine n...
February 14, 2014
2006 Chevrolet Impala LTZ 3.9L MIL Lamp on VIN: 2G1WU58106
P0171: Fuel System Lean. We have this car keeps setting code po171 lean bank1 smoked test engine for vaccum leaks none found fuel pressure is 70 psi.o2 sensor is swithching.i tested mass air flow sensor looked ok but with mileage i decided to install one but no luck.road testing the c...
February 20, 2014
2005 Land Rover LR3 SE 4.4L Hesitation, MIL Lamp on VIN: SALAA25495
P0171: lean bank one. ... here. Out of town customer stopped in at closing last night with car load of kids and dogs vehicle driven on highway for 1.5 hours then attempted to go up ski hill no power and checklight came on. Scanned codes p0171 and p0174 lean banks one and two. Also ...
February 21, 2014
2001 Ford Windstar LX 3.8L Poor Idle Quality, Hesitation, Stall, MIL Lamp on VIN: 2FMZA51411
P0171: fuel trim lean bk 1. ... have little prior history on it except the customer stated the spark plugs have been replaced many times due to fouling. On initial scan p0171,p0174 fuel trim lean codes were present. short term and long term fuel trims maxed out +25. Found vacuum line to ...
February 22, 2014
2000 Toyota Corolla VE 1.8L MIL Lamp on, P0171, New MAF VIN: 1NXBR12E2Y
P0171: Fuel System Too Lean (Bank 1). Fuel trims initially high, idle and cruise over 30% combined, with hesitation and power loss. Good fuel pressure, no intake metered air leaks, and no vacuum leaks detected with propane or smoke. Calculated Load at WOT snaps in bay and VE tests at max RPM on th...
February 24, 2014
2007 Toyota RAV4 2.4L Cuts out, Stall, Misfire, hard start VIN: JTMZD33V77
P0171: Fuel System Too Lean (Bank 1). So far, I have run into a wall on this vehicle. Car has a po171, and cold it is a very extended crank, upwards of 30-45 seconds. Did notice a stumble/misfire when first started cold but that cleared up within 10 seconds and could not duplicate it. Fuel trims ...
February 25, 2014
2001 Toyota Corolla CE 1.8L MIL Lamp on VIN: 1NXBR12E21
P0171: Fuel System Too Lean (Bank 1). I have this corolla giving me a hard time if i watch my fuel trims they bounch around sometimes at 2500 rpm from -20 to plus 20 for no reason then i get a fuel trim malfunction code i changed the maf sensor got rid of the po 171 code but this thing runs great ...
February 26, 2014
2006 Volkswagen Jetta GLI 2.0L MIL Lamp on VIN: 3VWXJ71K56
P0171: system lean. ... 2.0 turbo? It came in with no drivability complaints but had a p0171 lean code. I've replaced plenty of valve covers on the 2.5 for this, so the first thing I did was pulled the dipstick. When I did, the engine started to stumble and I found obvious vacuum...
February 27, 2014
2006 Volkswagen Jetta GLI 2.0L MIL Lamp on VIN: 3VWXJ71K56
P0171: system lean. ... 2.0 turbo? It came in with no drivability complaints but had a p0171 lean code. I've replaced plenty of valve covers on the 2.5 for this, so the first thing I did was pulled the dipstick. When I did, the engine started to stumble and I found obvious vacuum...
February 28, 2014
2003 Toyota Corolla CE 1.8L MIL Lamp on VIN: 2T1BR32E53
P0171: Fuel System Too Lean (Bank 1). ... light with code P0171 - Fuel trim too lean. Visual inspection and smoke test cannot find any vacuum leak. Road test to determine if MAF at fault but all data reading look ok other than fuel trim. Short term fuel trim reading are 7% and long term at around ...
February 07, 2014
1999 Mazda B4000 SE 4.0L Poor Idle Quality, Hesitation, Cuts out, Misfire, MIL Lamp on VIN: 4F4ZR17X6X
P0171: Adaptive Fuel Trim Too Lean (Bank 1). First, all data readings are at idle. Symptom is intermittent and will happen at idle and/or cruising. Customer complained of always running rough while cold, and now it runs rough with no power intermittently hot along with the rough cold idle. Related histor...
February 10, 2014
2003 Toyota Corolla CE 1.8L MIL Lamp on VIN: 2T1BR32E53
P0171: Fuel System Too Lean (Bank 1). ... light with code P0171 - Fuel trim too lean. Visual inspection and smoke test cannot find any vacuum leak. Road test to determine if MAF at fault but all data reading look ok other than fuel trim. Short term fuel trim reading are 7% and long term at around ...
February 10, 2014
1999 Ford Ranger XLT 4.0L MIL Lamp on VIN: 1FTZR15X1X
P0171: Lean Bank 1. ... issues. Scan showed P0171 & P0174 codes. Smoked engine and found bad upper intake gaskets. Replaced gaskets and re-smoked. No new smoke evident. Cleared codes and road tested. After 2 drive cycles P0171 & P0174 returned. The LT Fuel trims were at 2...
February 11, 2014
1999 Mazda B4000 SE 4.0L Poor Idle Quality, Hesitation, Cuts out, Misfire, MIL Lamp on VIN: 4F4ZR17X6X
P0171: Adaptive Fuel Trim Too Lean (Bank 1). First, all data readings are at idle. Symptom is intermittent and will happen at idle and/or cruising. Customer complained of always running rough while cold, and now it runs rough with no power intermittently hot along with the rough cold idle. Related histor...
February 11, 2014
2005 Acura TL 3.2L MIL Lamp on VIN: 19UUA65655
P0171: Fuel System Too Lean (Bank 1). ... insane. Car came in 2 weeks ago with P0171 and P0174, at the time didn't have much time to check it, so just cleared the codes and asked customer to bring it back if MIL returned, well its here. Its a MAP system, no MAF. Vehicle at idle has LT trims aroun...
February 12, 2014
2003 Ford Taurus LX 3.0L Hesitation, Cuts out, Misfire, MIL Lamp on VIN: 1FAFP55283
P0171: System to lean Bank 1. ... crasy,when it came to the shop i had all the code above PO316 PO302 PO174 PO171, Also PO741 I service the Transmission and replace the Filter wish was real bad, the code came back, i call the Customer and he say not to worry about it, just get the Engine n...
February 14, 2014
2006 Chevrolet Impala LTZ 3.9L MIL Lamp on VIN: 2G1WU58106
P0171: Fuel System Lean. We have this car keeps setting code po171 lean bank1 smoked test engine for vaccum leaks none found fuel pressure is 70 psi.o2 sensor is swithching.i tested mass air flow sensor looked ok but with mileage i decided to install one but no luck.road testing the c...
February 20, 2014
2005 Land Rover LR3 SE 4.4L Hesitation, MIL Lamp on VIN: SALAA25495
P0171: lean bank one. ... here. Out of town customer stopped in at closing last night with car load of kids and dogs vehicle driven on highway for 1.5 hours then attempted to go up ski hill no power and checklight came on. Scanned codes p0171 and p0174 lean banks one and two. Also ...
February 21, 2014
2001 Ford Windstar LX 3.8L Poor Idle Quality, Hesitation, Stall, MIL Lamp on VIN: 2FMZA51411
P0171: fuel trim lean bk 1. ... have little prior history on it except the customer stated the spark plugs have been replaced many times due to fouling. On initial scan p0171,p0174 fuel trim lean codes were present. short term and long term fuel trims maxed out +25. Found vacuum line to ...
February 22, 2014
2000 Toyota Corolla VE 1.8L MIL Lamp on, P0171, New MAF VIN: 1NXBR12E2Y
P0171: Fuel System Too Lean (Bank 1). Fuel trims initially high, idle and cruise over 30% combined, with hesitation and power loss. Good fuel pressure, no intake metered air leaks, and no vacuum leaks detected with propane or smoke. Calculated Load at WOT snaps in bay and VE tests at max RPM on th...
February 24, 2014
2007 Toyota RAV4 2.4L Cuts out, Stall, Misfire, hard start VIN: JTMZD33V77
P0171: Fuel System Too Lean (Bank 1). So far, I have run into a wall on this vehicle. Car has a po171, and cold it is a very extended crank, upwards of 30-45 seconds. Did notice a stumble/misfire when first started cold but that cleared up within 10 seconds and could not duplicate it. Fuel trims ...
February 25, 2014
2001 Toyota Corolla CE 1.8L MIL Lamp on VIN: 1NXBR12E21
P0171: Fuel System Too Lean (Bank 1). I have this corolla giving me a hard time if i watch my fuel trims they bounch around sometimes at 2500 rpm from -20 to plus 20 for no reason then i get a fuel trim malfunction code i changed the maf sensor got rid of the po 171 code but this thing runs great ...
February 26, 2014
2006 Volkswagen Jetta GLI 2.0L MIL Lamp on VIN: 3VWXJ71K56
P0171: system lean. ... 2.0 turbo? It came in with no drivability complaints but had a p0171 lean code. I've replaced plenty of valve covers on the 2.5 for this, so the first thing I did was pulled the dipstick. When I did, the engine started to stumble and I found obvious vacuum...
February 27, 2014
2006 Volkswagen Jetta GLI 2.0L MIL Lamp on VIN: 3VWXJ71K56
P0171: system lean. ... 2.0 turbo? It came in with no drivability complaints but had a p0171 lean code. I've replaced plenty of valve covers on the 2.5 for this, so the first thing I did was pulled the dipstick. When I did, the engine started to stumble and I found obvious vacuum...
February 28, 2014
2002 GMC Yukon XL 1500 SLE 5.3L Misfire, MIL Lamp on VIN: 1GKFK16T52
P0171: Fuel Trim System Lean (Bank 1). All tune up parts including fuel filter look new and in good condition. It only has misfire on multiple cylinders on fist startup of the day, runs good after warms up. On cold start the short term trims on both cylinders was about 30. After it warms up the sho...
February 05, 2014
2003 Toyota Corolla CE 1.8L MIL Lamp on VIN: 2T1BR32E53
P0171: Fuel System Too Lean (Bank 1). ... light with code P0171 - Fuel trim too lean. Visual inspection and smoke test cannot find any vacuum leak. Road test to determine if MAF at fault but all data reading look ok other than fuel trim. Short term fuel trim reading are 7% and long term at around ...
February 07, 2014
1999 Mazda B4000 SE 4.0L Poor Idle Quality, Hesitation, Cuts out, Misfire, MIL Lamp on VIN: 4F4ZR17X6X
P0171: Adaptive Fuel Trim Too Lean (Bank 1). First, all data readings are at idle. Symptom is intermittent and will happen at idle and/or cruising. Customer complained of always running rough while cold, and now it runs rough with no power intermittently hot along with the rough cold idle. Related histor...
February 10, 2014
2003 Toyota Corolla CE 1.8L MIL Lamp on VIN: 2T1BR32E53
P0171: Fuel System Too Lean (Bank 1). ... light with code P0171 - Fuel trim too lean. Visual inspection and smoke test cannot find any vacuum leak. Road test to determine if MAF at fault but all data reading look ok other than fuel trim. Short term fuel trim reading are 7% and long term at around ...
February 10, 2014
1999 Ford Ranger XLT 4.0L MIL Lamp on VIN: 1FTZR15X1X
P0171: Lean Bank 1. ... issues. Scan showed P0171 & P0174 codes. Smoked engine and found bad upper intake gaskets. Replaced gaskets and re-smoked. No new smoke evident. Cleared codes and road tested. After 2 drive cycles P0171 & P0174 returned. The LT Fuel trims were at 2...
February 11, 2014
1999 Mazda B4000 SE 4.0L Poor Idle Quality, Hesitation, Cuts out, Misfire, MIL Lamp on VIN: 4F4ZR17X6X
P0171: Adaptive Fuel Trim Too Lean (Bank 1). First, all data readings are at idle. Symptom is intermittent and will happen at idle and/or cruising. Customer complained of always running rough while cold, and now it runs rough with no power intermittently hot along with the rough cold idle. Related histor...
February 11, 2014
2005 Acura TL 3.2L MIL Lamp on VIN: 19UUA65655
P0171: Fuel System Too Lean (Bank 1). ... insane. Car came in 2 weeks ago with P0171 and P0174, at the time didn't have much time to check it, so just cleared the codes and asked customer to bring it back if MIL returned, well its here. Its a MAP system, no MAF. Vehicle at idle has LT trims aroun...
February 12, 2014
2003 Ford Taurus LX 3.0L Hesitation, Cuts out, Misfire, MIL Lamp on VIN: 1FAFP55283
P0171: System to lean Bank 1. ... crasy,when it came to the shop i had all the code above PO316 PO302 PO174 PO171, Also PO741 I service the Transmission and replace the Filter wish was real bad, the code came back, i call the Customer and he say not to worry about it, just get the Engine n...
February 14, 2014
2006 Chevrolet Impala LTZ 3.9L MIL Lamp on VIN: 2G1WU58106
P0171: Fuel System Lean. We have this car keeps setting code po171 lean bank1 smoked test engine for vaccum leaks none found fuel pressure is 70 psi.o2 sensor is swithching.i tested mass air flow sensor looked ok but with mileage i decided to install one but no luck.road testing the c...
February 20, 2014
2005 Land Rover LR3 SE 4.4L Hesitation, MIL Lamp on VIN: SALAA25495
P0171: lean bank one. ... here. Out of town customer stopped in at closing last night with car load of kids and dogs vehicle driven on highway for 1.5 hours then attempted to go up ski hill no power and checklight came on. Scanned codes p0171 and p0174 lean banks one and two. Also ...
February 21, 2014
2001 Ford Windstar LX 3.8L Poor Idle Quality, Hesitation, Stall, MIL Lamp on VIN: 2FMZA51411
P0171: fuel trim lean bk 1. ... have little prior history on it except the customer stated the spark plugs have been replaced many times due to fouling. On initial scan p0171,p0174 fuel trim lean codes were present. short term and long term fuel trims maxed out +25. Found vacuum line to ...
February 22, 2014
2000 Toyota Corolla VE 1.8L MIL Lamp on, P0171, New MAF VIN: 1NXBR12E2Y
P0171: Fuel System Too Lean (Bank 1). Fuel trims initially high, idle and cruise over 30% combined, with hesitation and power loss. Good fuel pressure, no intake metered air leaks, and no vacuum leaks detected with propane or smoke. Calculated Load at WOT snaps in bay and VE tests at max RPM on th...
February 24, 2014
2007 Toyota RAV4 2.4L Cuts out, Stall, Misfire, hard start VIN: JTMZD33V77
P0171: Fuel System Too Lean (Bank 1). So far, I have run into a wall on this vehicle. Car has a po171, and cold it is a very extended crank, upwards of 30-45 seconds. Did notice a stumble/misfire when first started cold but that cleared up within 10 seconds and could not duplicate it. Fuel trims ...
February 25, 2014
2001 Toyota Corolla CE 1.8L MIL Lamp on VIN: 1NXBR12E21
P0171: Fuel System Too Lean (Bank 1). I have this corolla giving me a hard time if i watch my fuel trims they bounch around sometimes at 2500 rpm from -20 to plus 20 for no reason then i get a fuel trim malfunction code i changed the maf sensor got rid of the po 171 code but this thing runs great ...
February 26, 2014
2006 Volkswagen Jetta GLI 2.0L MIL Lamp on VIN: 3VWXJ71K56
P0171: system lean. ... 2.0 turbo? It came in with no drivability complaints but had a p0171 lean code. I've replaced plenty of valve covers on the 2.5 for this, so the first thing I did was pulled the dipstick. When I did, the engine started to stumble and I found obvious vacuum...
February 27, 2014
2006 Volkswagen Jetta GLI 2.0L MIL Lamp on VIN: 3VWXJ71K56
P0171: system lean. ... 2.0 turbo? It came in with no drivability complaints but had a p0171 lean code. I've replaced plenty of valve covers on the 2.5 for this, so the first thing I did was pulled the dipstick. When I did, the engine started to stumble and I found obvious vacuum...
February 28, 2014
2002 GMC Yukon XL 1500 SLE 5.3L Misfire, MIL Lamp on VIN: 1GKFK16T52
P0171: Fuel Trim System Lean (Bank 1). All tune up parts including fuel filter look new and in good condition. It only has misfire on multiple cylinders on fist startup of the day, runs good after warms up. On cold start the short term trims on both cylinders was about 30. After it warms up the sho...
February 05, 2014
2003 Toyota Corolla CE 1.8L MIL Lamp on VIN: 2T1BR32E53
P0171: Fuel System Too Lean (Bank 1). ... light with code P0171 - Fuel trim too lean. Visual inspection and smoke test cannot find any vacuum leak. Road test to determine if MAF at fault but all data reading look ok other than fuel trim. Short term fuel trim reading are 7% and long term at around ...
February 07, 2014
1999 Mazda B4000 SE 4.0L Poor Idle Quality, Hesitation, Cuts out, Misfire, MIL Lamp on VIN: 4F4ZR17X6X
P0171: Adaptive Fuel Trim Too Lean (Bank 1). First, all data readings are at idle. Symptom is intermittent and will happen at idle and/or cruising. Customer complained of always running rough while cold, and now it runs rough with no power intermittently hot along with the rough cold idle. Related histor...
February 10, 2014
2003 Toyota Corolla CE 1.8L MIL Lamp on VIN: 2T1BR32E53
P0171: Fuel System Too Lean (Bank 1). ... light with code P0171 - Fuel trim too lean. Visual inspection and smoke test cannot find any vacuum leak. Road test to determine if MAF at fault but all data reading look ok other than fuel trim. Short term fuel trim reading are 7% and long term at around ...
February 10, 2014
1999 Ford Ranger XLT 4.0L MIL Lamp on VIN: 1FTZR15X1X
P0171: Lean Bank 1. ... issues. Scan showed P0171 & P0174 codes. Smoked engine and found bad upper intake gaskets. Replaced gaskets and re-smoked. No new smoke evident. Cleared codes and road tested. After 2 drive cycles P0171 & P0174 returned. The LT Fuel trims were at 2...
February 11, 2014
1999 Mazda B4000 SE 4.0L Poor Idle Quality, Hesitation, Cuts out, Misfire, MIL Lamp on VIN: 4F4ZR17X6X
P0171: Adaptive Fuel Trim Too Lean (Bank 1). First, all data readings are at idle. Symptom is intermittent and will happen at idle and/or cruising. Customer complained of always running rough while cold, and now it runs rough with no power intermittently hot along with the rough cold idle. Related histor...
February 11, 2014
2005 Acura TL 3.2L MIL Lamp on VIN: 19UUA65655
P0171: Fuel System Too Lean (Bank 1). ... ago with P0171 and P0174, at the time didn't have much time to check it, so just cleared the codes and asked customer to bring it back if MIL returned, well its here. Its a MAP system, no MAF. Vehicle at idle has LT trims aroun...
February 12, 2014
2003 Ford Taurus LX 3.0L Hesitation, Cuts out, Misfire, MIL Lamp on VIN: 1FAFP55283
P0171: System to lean Bank 1. ... crasy,when it came to the shop i had all the code above PO316 PO302 PO174 PO171, Also PO741 I service the Transmission and replace the Filter wish was real bad, the code came back, i call the Customer and he say not to worry about it, just get the Engine n...
February 14, 2014
2006 Chevrolet Impala LTZ 3.9L MIL Lamp on VIN: 2G1WU58106
P0171: Fuel System Lean. We have this car keeps setting code po171 lean bank1 smoked test engine for vaccum leaks none found fuel pressure is 70 psi.o2 sensor is swithching.i tested mass air flow sensor looked ok but with mileage i decided to install one but no luck.road testing the c...
February 20, 2014
2005 Land Rover LR3 SE 4.4L Hesitation, MIL Lamp on VIN: SALAA25495
P0171: lean bank one. ... in at closing last night with car load of kids and dogs vehicle driven on highway for 1.5 hours then attempted to go up ski hill no power and checklight came on. Scanned codes p0171 and p0174 lean banks one and two. Also ...
February 21, 2014
2001 Ford Windstar LX 3.8L Poor Idle Quality, Hesitation, Stall, MIL Lamp on VIN: 2FMZA51411
P0171: fuel trim lean bk 1. ... except the customer stated the spark plugs have been replaced many times due to fouling. On initial scan p0171,p0174 fuel trim lean codes were present. short term and long term fuel trims maxed out +25. Found vacuum line to ...
February 22, 2014
2000 Toyota Corolla VE 1.8L MIL Lamp on, P0171, New MAF VIN: 1NXBR12E2Y
P0171: Fuel System Too Lean (Bank 1). Fuel trims initially high, idle and cruise over 30% combined, with hesitation and power loss. Good fuel pressure, no intake metered air leaks, and no vacuum leaks detected with propane or smoke. Calculated Load at WOT snaps in bay and VE tests at max RPM on th...
February 24, 2014
2007 Toyota RAV4 2.4L Cuts out, Stall, Misfire, hard start VIN: JTMZD33V77
P0171: Fuel System Too Lean (Bank 1). So far, I have run into a wall on this vehicle. Car has a po171, and cold it is a very extended crank, upwards of 30-45 seconds. Did notice a stumble/misfire when first started cold but that cleared up within 10 seconds and could not duplicate it. Fuel trims ...
February 25, 2014
2001 Toyota Corolla CE 1.8L MIL Lamp on VIN: 1NXBR12E21
P0171: Fuel System Too Lean (Bank 1). I have this corolla giving me a hard time if i watch my fuel trims they bounch around sometimes at 2500 rpm from -20 to plus 20 for no reason then i get a fuel trim malfunction code i changed the maf sensor got rid of the po 171 code but this thing runs great ...
February 26, 2014
2006 Volkswagen Jetta GLI 2.0L MIL Lamp on VIN: 3VWXJ71K56
P0171: system lean. ... 2.0 turbo? It came in with no drivability complaints but had a p0171 lean code. I've replaced plenty of valve covers on the 2.5 for this, so the first thing I did was pulled the dipstick. When I did, the engine started to stumble and I found obvious vacuum...
February 27, 2014
2006 Volkswagen Jetta GLI 2.0L MIL Lamp on VIN: 3VWXJ71K56
P0171: system lean. ... 2.0 turbo? It came in with no drivability complaints but had a p0171 lean code. I've replaced plenty of valve covers on the 2.5 for this, so the first thing I did was pulled the dipstick. When I did, the engine started to stumble and I found obvious vacuum...
February 28, 2014