Join Now
International Automotive Technicians Network

P0171 Diagnostic Trouble Code Discussion for December 2013

Fuel System Lean (Bank 1)


Note: This is a professional automotive technician's resource.
Vehicle Owners: If you are seeking an automotive repair professional to service your vehicle, visit the iATN Repair Shop Finder.

Trouble Ticket Help Requests for DTC P0171
Help Request Posted
2007 GMC Acadia SLT 3.6L MIL Lamp on VIN: 1GKER33727
P0171: Fuel System Lean (Bank 1). Vehicle came in for Traction control light, stabiltrak and check engine light on. Ran codes on the PCM and found lean bank one and two. Checked Data and LT FT bank 1 was at +35% same for bank 2. ST FT was at +25% fuel injector pulse width is at 2.9ms. Way too ...
December 09, 2013
2000 Ford F-150 Lariat 5.4L Poor Idle Quality VIN: 1FTRX18L8Y
... on going pain. P0171 & P0174. In the past we found pcv hose and repaired, and put on MAF and it would stay gone for a while. Now is coming on all the time. He has put on a number of MAF sensors, I have smoked it a number of time and never found anythin...
December 12, 2013
2000 Ford F-150 Lariat 5.4L Poor Idle Quality VIN: 1FTRX18L8Y
... on going pain. P0171 & P0174. In the past we found pcv hose and repaired, and put on MAF and it would stay gone for a while. Now is coming on all the time. He has put on a number of MAF sensors, I have smoked it a number of time and never found anythin...
December 13, 2013
2001 Toyota Celica GT 1.8L MIL Lamp on VIN: JTDDR32T91
P0171: Fuel System Too Lean (Bank 1). Hello IATN team I'm writing hoping you can give a clue to find the fix to this problem. Very common code on these toyotas and most of the time is the air flow meter is dirty or the typical vacuum leak. But this celica has no leaks and the maf was replaced wit...
December 17, 2013
2002 Ford F-150 Lariat 5.4L MIL Lamp on VIN: 1FTRW08L62
P0171: Fuel System Too Lean Bank 2. Any help you guys can offer would be greatly appreciated, this truck is kicking our a$$es. Originally came in with just a P0174 (lean condition Bank 2). We smoked the intake for leaks and found the PCV valve to be leaking a bit, so we replaced the PCV and Gro...
December 18, 2013
2003 Ford Ranger Edge 3.0L Hesitation, Stall, Misfire, MIL Lamp on VIN: 1FTYR14V13
P0171: fuel system lean bank2. I need help I have a 2003 ford ranger 3.0l v6 that has p0304 and p0174 code it has hardly no power at wide open throttle it is spark knocking bad. checked compression it is 115psi has good spark cylinder 4 pulled injector connector while running at idle for cy...
December 19, 2013
2000 Chevrolet Silverado 1500 4.8L MIL Lamp on VIN: 1GCEK14V7Y
P0171: Fuel Trim System Lean (Bank 1). ... mil with P0171 and P0174, lean banks 1 and 2. Engine starts and runs perfectly with no symptoms. First, I replaced the fuel filter because fuel pressure was 2 psi low. No effect. Then I replaced the fuel pressure regulator. The pressure corrected but the c...
December 31, 2013
2001 GMC Yukon Denali 6.0L Poor Idle Quality, Surge, MIL Lamp on VIN: 1GKEK63U41
P0171: Fuel Trim System Lean (Bank 1). ... misfire, to stall, and mil on when cold and hot. Replaced ignition wires that were scored, replaced both front o2s because they were stuck at 20 to 50 mV all the time. The misfires are gone, it runs great on the road but it has a slightly rough idle. O2s s...
December 31, 2013
2000 Chevrolet Silverado 1500 4.8L MIL Lamp on VIN: 1GCEK14V7Y
P0171: Fuel Trim System Lean (Bank 1). ... mil with P0171 and P0174, lean banks 1 and 2. Engine starts and runs perfectly with no symptoms. First, I replaced the fuel filter because fuel pressure was 2 psi low. No effect. Then I replaced the fuel pressure regulator. The pressure corrected but the c...
December 31, 2013
2001 GMC Yukon Denali 6.0L Poor Idle Quality, Surge, MIL Lamp on VIN: 1GKEK63U41
P0171: Fuel Trim System Lean (Bank 1). ... misfire, to stall, and mil on when cold and hot. Replaced ignition wires that were scored, replaced both front o2s because they were stuck at 20 to 50 mV all the time. The misfires are gone, it runs great on the road but it has a slightly rough idle. O2s s...
December 31, 2013
2007 GMC Acadia SLT 3.6L MIL Lamp on VIN: 1GKER33727
P0171: Fuel System Lean (Bank 1). Vehicle came in for Traction control light, stabiltrak and check engine light on. Ran codes on the PCM and found lean bank one and two. Checked Data and LT FT bank 1 was at +35% same for bank 2. ST FT was at +25% fuel injector pulse width is at 2.9ms. Way too ...
December 09, 2013
2000 Ford F-150 Lariat 5.4L Poor Idle Quality VIN: 1FTRX18L8Y
... on going pain. P0171 & P0174. In the past we found pcv hose and repaired, and put on MAF and it would stay gone for a while. Now is coming on all the time. He has put on a number of MAF sensors, I have smoked it a number of time and never found anythin...
December 12, 2013
2000 Ford F-150 Lariat 5.4L Poor Idle Quality VIN: 1FTRX18L8Y
... on going pain. P0171 & P0174. In the past we found pcv hose and repaired, and put on MAF and it would stay gone for a while. Now is coming on all the time. He has put on a number of MAF sensors, I have smoked it a number of time and never found anythin...
December 13, 2013
2001 Toyota Celica GT 1.8L MIL Lamp on VIN: JTDDR32T91
P0171: Fuel System Too Lean (Bank 1). Hello IATN team I'm writing hoping you can give a clue to find the fix to this problem. Very common code on these toyotas and most of the time is the air flow meter is dirty or the typical vacuum leak. But this celica has no leaks and the maf was replaced wit...
December 17, 2013
2002 Ford F-150 Lariat 5.4L MIL Lamp on VIN: 1FTRW08L62
P0171: Fuel System Too Lean Bank 2. ... greatly appreciated, this truck is kicking our a$$es. Originally came in with just a P0174 (lean condition Bank 2). We smoked the intake for leaks and found the PCV valve to be leaking a bit, so we replaced the PCV and Grommet. The EGR and the IAC seemed ...
December 18, 2013
2003 Ford Ranger Edge 3.0L Hesitation, Stall, Misfire, MIL Lamp on VIN: 1FTYR14V13
P0171: fuel system lean bank2. I need help I have a 2003 ford ranger 3.0l v6 that has p0304 and p0174 code it has hardly no power at wide open throttle it is spark knocking bad. checked compression it is 115psi has good spark cylinder 4 pulled injector connector while running at idle for cy...
December 19, 2013
2000 Chevrolet Silverado 1500 4.8L MIL Lamp on VIN: 1GCEK14V7Y
P0171: Fuel Trim System Lean (Bank 1). ... mil with P0171 and P0174, lean banks 1 and 2. Engine starts and runs perfectly with no symptoms. First, I replaced the fuel filter because fuel pressure was 2 psi low. No effect. Then I replaced the fuel pressure regulator. The pressure corrected but the c...
December 31, 2013
2001 GMC Yukon Denali 6.0L Poor Idle Quality, Surge, MIL Lamp on VIN: 1GKEK63U41
P0171: Fuel Trim System Lean (Bank 1). ... misfire, to stall, and mil on when cold and hot. Replaced ignition wires that were scored, replaced both front o2s because they were stuck at 20 to 50 mV all the time. The misfires are gone, it runs great on the road but it has a slightly rough idle. O2s s...
December 31, 2013