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P0171 Diagnostic Trouble Code Discussion for April 2013

Fuel System Lean (Bank 1)


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Trouble Ticket Help Requests for DTC P0171
Help Request Posted
2002 Ford F-150 King Ranch 4.6L MIL Lamp on VIN: 1FTRW07682
P0171: Lean bank 1. have codes p0171 and p0401 replaced bank 1 o2 and DPFE but codes keep coming back.spray carb cleaner on intake but cannot find a vacuum leak.pcv hose looks ok.i put vacuum on egr with engine running and it makes no difference how engine runs so i pulled valve ...
April 03, 2013
2004 Mazda 6 S 3.0L Hesitation, Surge, Stall
P0171: Adaptive Fuel Trim Too Lean (Bank 1). Hi guys i need some new ideas. This Mazda 6 has me stumped. When driven for half hour or so it will fall on its face when kicked down to passing gear around 4000 rpm until it shifts. It would also backfire (lean farts). I installed a fuel pressure gauge inline...
April 04, 2013
2003 Dodge Ram 2500 Truck 5.7L MIL Lamp on VIN: 1D7KU28D03
P0171: Fuel System Lean (Bank 1). Day after doining oil change customer came back with check engine light on. Code Po131 circuit voltage too low 02 sensor. Replaced with denso o2 sensor. I now have a new code Po171 system too lean. Replaced 02 sensor with bosch this time . Still have code Po17...
April 10, 2013
2005 Ford F-250 Super Duty FX4 5.4L Poor Idle Quality, Hesitation, Cuts out, Misfire VIN: 1FTNF21545
P0171: Lean. Customer brought vehicle in stating vehicle looses power intermittently. I disconnected camshaft solenoids and it does not make a difference. I watched the camshaft sensors on a lab scope and there patterns differ. I switched the camshaft sensors and I still g...
April 10, 2013
2007 Ford Taurus SEL 3.0L Excessive Emissions, Poor Idle Quality, Hesitation, Surge, Misfire, MIL Lamp on VIN: 1FAHP56U77
P0171: Lean Bank 1. Smoked upper intake. Found PCV connector MELTED at the rear face downstream from the "O" ring that is supposed to seal the connector from vacuum leaks. The connector fits between PCV tube running from PCV valve to the upper intake manifold where it is ...
April 10, 2013
2002 Ford Focus LX 2.0L Excessive Emissions, Misfire VIN: 1FAFP33P02
P0171: lean b1. Greetings ladies and gentlemen: Customer brought their vehicle in with concerns of rough idle as well as check engine light coming on intermittantly. Verified both concerns as well as flashing check engine light with extended idle. Seems worse when engine is...
April 16, 2013
1996 Cadillac Fleetwood 5.7L low power/vacuum VIN: 1G6DW52P8T
P0171: Fuel Trim System Lean (Bank 1). Customer complaint is low power and check engine light on. The fuel pump solved part of the low power problem, but it is still weaker than I would like to see for an LT1, and it is continuing to set lean codes. I also have an evap problem, but I have isolated ...
April 19, 2013
2006 Ford F-150 XLT 5.4L Poor Idle Quality, Hesitation, MIL Lamp on VIN: 1FTPW14546
P0171: system too lean bank 1. Vehicle came in on the tow truck because it lost power on the highway. Truck runs and drives fine under light acceleration. Under medium to heavy acceleration the truck just does not accelerate. Feels and sounds like a maf or converter problem. STFT 1 AND 2 AR...
April 20, 2013
2004 Suzuki Verona LX 2.5L Excessive Emissions, Hesitation, MIL Lamp on VIN: KL5VJ52L14
P0171: Fuel System Too Lean (Bank 1). ... Suzuki The car came in for a check engine light found P0171,P0174,P0401 checked and found EGR inop and replaced EGR found the intake seals one cly one sticking out and leaking replaced intak...
April 21, 2013
1996 Cadillac Fleetwood 5.7L low power/vacuum VIN: 1G6DW52P8T
P0171: Fuel Trim System Lean (Bank 1). Customer complaint is low power and check engine light on. The fuel pump solved part of the low power problem, but it is still weaker than I would like to see for an LT1, and it is continuing to set lean codes. I also have an evap problem, but I have isolated ...
April 22, 2013
2002 Ford Focus LX 2.0L Excessive Emissions, Misfire VIN: 1FAFP33P02
P0171: lean b1. Greetings ladies and gentlemen: Customer brought their vehicle in with concerns of rough idle as well as check engine light coming on intermittantly. Verified both concerns as well as flashing check engine light with extended idle. Seems worse when engine is...
April 22, 2013
2008 Ford Focus S 2.0L Poor Idle Quality, MIL Lamp on VIN: 1FAHP34N38
P0171: Bank 1 Lean. ... me scratch my head. I hope someone can help me out. Customer came in complaining of no power with engine light on. P0171 was the code. Checked and long term was maxed out. Found dirty MAF and replaced. Car runs great, long term and short term were around z...
April 22, 2013
2006 Kia Sedona LX 3.8L Misfire VIN: KNDMB23316
P0171: Fuel System Too Lean (Bank 1). This fine kia has a misfire under load engine light blinks feels like it wants to stall,shut key off and restart runs fine random misfire code misfire counters are all at zero,not sure where to go next any help .
April 24, 2013
2009 Toyota Sienna LE 3.5L MIL Lamp on VIN: 5TDZK23C09
P0171: lean bank 1. i have this sienna that is running lean on both banks, i have replaced the mass air and o2 sensors from a running van with no change, plugged off the brake booster, changed the intake gaskets t/b gasket, fresh air intake hose from rear v/c to air box, pcv valv...
April 24, 2013
2009 Toyota Sienna LE 3.5L MIL Lamp on VIN: 5TDZK23C09
P0171: lean bank 1. i have this sienna that is running lean on both banks, i have replaced the mass air and o2 sensors from a running van with no change, plugged off the brake booster, changed the intake gaskets t/b gasket, fresh air intake hose from rear v/c to air box, pcv valv...
April 25, 2013
2002 Ford F-150 King Ranch 4.6L MIL Lamp on VIN: 1FTRW07682
P0171: Lean bank 1. have codes p0171 and p0401 replaced bank 1 o2 and DPFE but codes keep coming back.spray carb cleaner on intake but cannot find a vacuum leak.pcv hose looks ok.i put vacuum on egr with engine running and it makes no difference how engine runs so i pulled valve ...
April 03, 2013
2004 Mazda 6 S 3.0L Hesitation, Surge, Stall
P0171: Adaptive Fuel Trim Too Lean (Bank 1). Hi guys i need some new ideas. This Mazda 6 has me stumped. When driven for half hour or so it will fall on its face when kicked down to passing gear around 4000 rpm until it shifts. It would also backfire (lean farts). I installed a fuel pressure gauge inline...
April 04, 2013
2003 Dodge Ram 2500 Truck 5.7L MIL Lamp on VIN: 1D7KU28D03
P0171: Fuel System Lean (Bank 1). Day after doining oil change customer came back with check engine light on. Code Po131 circuit voltage too low 02 sensor. Replaced with denso o2 sensor. I now have a new code Po171 system too lean. Replaced 02 sensor with bosch this time . Still have code Po17...
April 10, 2013
2005 Ford F-250 Super Duty FX4 5.4L Poor Idle Quality, Hesitation, Cuts out, Misfire VIN: 1FTNF21545
P0171: Lean. Customer brought vehicle in stating vehicle looses power intermittently. I disconnected camshaft solenoids and it does not make a difference. I watched the camshaft sensors on a lab scope and there patterns differ. I switched the camshaft sensors and I still g...
April 10, 2013
2007 Ford Taurus SEL 3.0L Excessive Emissions, Poor Idle Quality, Hesitation, Surge, Misfire, MIL Lamp on VIN: 1FAHP56U77
P0171: Lean Bank 1. Smoked upper intake. Found PCV connector MELTED at the rear face downstream from the "O" ring that is supposed to seal the connector from vacuum leaks. The connector fits between PCV tube running from PCV valve to the upper intake manifold where it is ...
April 10, 2013
2002 Ford Focus LX 2.0L Excessive Emissions, Misfire VIN: 1FAFP33P02
P0171: lean b1. Greetings ladies and gentlemen: Customer brought their vehicle in with concerns of rough idle as well as check engine light coming on intermittantly. Verified both concerns as well as flashing check engine light with extended idle. Seems worse when engine is...
April 16, 2013
1996 Cadillac Fleetwood 5.7L low power/vacuum VIN: 1G6DW52P8T
P0171: Fuel Trim System Lean (Bank 1). Customer complaint is low power and check engine light on. The fuel pump solved part of the low power problem, but it is still weaker than I would like to see for an LT1, and it is continuing to set lean codes. I also have an evap problem, but I have isolated ...
April 19, 2013
2006 Ford F-150 XLT 5.4L Poor Idle Quality, Hesitation, MIL Lamp on VIN: 1FTPW14546
P0171: system too lean bank 1. Vehicle came in on the tow truck because it lost power on the highway. Truck runs and drives fine under light acceleration. Under medium to heavy acceleration the truck just does not accelerate. Feels and sounds like a maf or converter problem. STFT 1 AND 2 AR...
April 20, 2013
2004 Suzuki Verona LX 2.5L Excessive Emissions, Hesitation, MIL Lamp on VIN: KL5VJ52L14
P0171: Fuel System Too Lean (Bank 1). ... Suzuki The car came in for a check engine light found P0171,P0174,P0401 checked and found EGR inop and replaced EGR found the intake seals one cly one sticking out and leaking replaced intak...
April 21, 2013
1996 Cadillac Fleetwood 5.7L low power/vacuum VIN: 1G6DW52P8T
P0171: Fuel Trim System Lean (Bank 1). Customer complaint is low power and check engine light on. The fuel pump solved part of the low power problem, but it is still weaker than I would like to see for an LT1, and it is continuing to set lean codes. I also have an evap problem, but I have isolated ...
April 22, 2013
2002 Ford Focus LX 2.0L Excessive Emissions, Misfire VIN: 1FAFP33P02
P0171: lean b1. Greetings ladies and gentlemen: Customer brought their vehicle in with concerns of rough idle as well as check engine light coming on intermittantly. Verified both concerns as well as flashing check engine light with extended idle. Seems worse when engine is...
April 22, 2013
2008 Ford Focus S 2.0L Poor Idle Quality, MIL Lamp on VIN: 1FAHP34N38
P0171: Bank 1 Lean. ... me scratch my head. I hope someone can help me out. Customer came in complaining of no power with engine light on. P0171 was the code. Checked and long term was maxed out. Found dirty MAF and replaced. Car runs great, long term and short term were around z...
April 22, 2013
2006 Kia Sedona LX 3.8L Misfire VIN: KNDMB23316
P0171: Fuel System Too Lean (Bank 1). This fine kia has a misfire under load engine light blinks feels like it wants to stall,shut key off and restart runs fine random misfire code misfire counters are all at zero,not sure where to go next any help .
April 24, 2013
2009 Toyota Sienna LE 3.5L MIL Lamp on VIN: 5TDZK23C09
P0171: lean bank 1. i have this sienna that is running lean on both banks, i have replaced the mass air and o2 sensors from a running van with no change, plugged off the brake booster, changed the intake gaskets t/b gasket, fresh air intake hose from rear v/c to air box, pcv valv...
April 24, 2013
2009 Toyota Sienna LE 3.5L MIL Lamp on VIN: 5TDZK23C09
P0171: lean bank 1. i have this sienna that is running lean on both banks, i have replaced the mass air and o2 sensors from a running van with no change, plugged off the brake booster, changed the intake gaskets t/b gasket, fresh air intake hose from rear v/c to air box, pcv valv...
April 25, 2013