Join Now
International Automotive Technicians Network

P0171 Diagnostic Trouble Code Discussion for August 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
2006 Dodge Ram 1500 Truck ST 4.7L Excessive Emissions, Poor Idle Quality, Misfire, Poor Fuel Economy, MIL Lamp on VIN: 1D7HU18N96
P0171: Fuel System Lean (Bank 1). I need some Dodge tech help. THis vehicle runs rough, black smoke out of tailpipe very poor gas mileage and of course cyl. misfire. I am not very aquainted with the newer Dodge pickups. This young man is headed for college soon and he doesn't want to go with t...
August 05, 2013
2002 Toyota Camry SE 2.4L MIL Lamp on VIN: JTDBE32K02
P0171: Fuel System Too Lean (Bank 1). I have lean code po171. My long term fuel trim was a t 28%. I check for a vacuum leak using brake clean and smoke machine. no leaks found. I pinched off brake booster hose with no change to fuel trims. Fuel pressure is at 50psi. within specs. I removed fuel fr...
August 07, 2013
1998 Ford F-150 Lariat 5.4L Poor Idle Quality VIN: 1FTRX08L6W
Thanks in advance...got an odd on here. Customer complained of a rough run. All codes indicate lean exhaust both banks. O2's were sluggish so we replaced them and now it has same problem but runs worse! problem only at idle. Bank to will clock around pos 22 at...
August 12, 2013
1999 Chevrolet K2500 5.7L MIL Lamp on
P0171: Fuel Trim System Lean (Bank 1). customer replaced fuel pump before we got involved. long term fuel trims 25% on both banks at idle. Smoked entire intake and found no leaks. Replaced maf twice, no change for better. Wondering if fuel pressure is too low or if injectors are starting to get res...
August 15, 2013
1999 Ford F-150 Lariat 5.4L Poor Idle Quality, MIL Lamp on VIN: 1FTRX18LXX
P0171: System too lean bank 1. Check engine light is on for bank 1 only running lean. Bank 2 is not indicated as too lean but LTFT is 19, LTFT on B1 is 25+. No vacuum leaks found. It seems only when vehicle engine cold the problem occurs. At warm idle, the STFT are always 0 +/- 3%. Odometer...
August 15, 2013
1999 Chevrolet K2500 5.7L MIL Lamp on
P0171: Fuel Trim System Lean (Bank 1). customer replaced fuel pump before we got involved. long term fuel trims 25% on both banks at idle. Smoked entire intake and found no leaks. Replaced maf twice, no change for better. Wondering if fuel pressure is too low or if injectors are starting to get res...
August 16, 2013
2005 Land Rover LR3 SE 4.4L MIL Lamp on VIN: SALAE25485
P0171: system lean bank a. We have this lr3 and it will set a 171 and 174 at idle without even driving. This was noticed after the park brake module was replaced so we smoke tested all the evap lines and intake and found nothing for vac. leaks. checked and cleaned the maf. Thing is it w...
August 19, 2013
2011 Honda Odyssey EX 3.5L No Start VIN: 5FNRL5H48B
P0171: Fuel system too lean right bank. ... found p0171 and 174, 2nd, check gas for contamination, first sample was dark but, no water was found, second sample was clearer, 3rd sample was good , 3rd we checked the fuel pressure, perfect, then we try to run the engine using the fuel inj cleaning cani...
August 26, 2013
2006 Dodge Ram 1500 Truck ST 4.7L Excessive Emissions, Poor Idle Quality, Misfire, Poor Fuel Economy, MIL Lamp on VIN: 1D7HU18N96
P0171: Fuel System Lean (Bank 1). I need some Dodge tech help. THis vehicle runs rough, black smoke out of tailpipe very poor gas mileage and of course cyl. misfire. I am not very aquainted with the newer Dodge pickups. This young man is headed for college soon and he doesn't want to go with t...
August 05, 2013
2002 Toyota Camry SE 2.4L MIL Lamp on VIN: JTDBE32K02
P0171: Fuel System Too Lean (Bank 1). I have lean code po171. My long term fuel trim was a t 28%. I check for a vacuum leak using brake clean and smoke machine. no leaks found. I pinched off brake booster hose with no change to fuel trims. Fuel pressure is at 50psi. within specs. I removed fuel fr...
August 07, 2013
1998 Ford F-150 Lariat 5.4L Poor Idle Quality VIN: 1FTRX08L6W
Thanks in advance...got an odd on here. Customer complained of a rough run. All codes indicate lean exhaust both banks. O2's were sluggish so we replaced them and now it has same problem but runs worse! problem only at idle. Bank to will clock around pos 22 at...
August 12, 2013
1999 Chevrolet K2500 5.7L MIL Lamp on
P0171: Fuel Trim System Lean (Bank 1). customer replaced fuel pump before we got involved. long term fuel trims 25% on both banks at idle. Smoked entire intake and found no leaks. Replaced maf twice, no change for better. Wondering if fuel pressure is too low or if injectors are starting to get res...
August 15, 2013
1999 Ford F-150 Lariat 5.4L Poor Idle Quality, MIL Lamp on VIN: 1FTRX18LXX
P0171: System too lean bank 1. Check engine light is on for bank 1 only running lean. Bank 2 is not indicated as too lean but LTFT is 19, LTFT on B1 is 25+. No vacuum leaks found. It seems only when vehicle engine cold the problem occurs. At warm idle, the STFT are always 0 +/- 3%. Odometer...
August 15, 2013
1999 Chevrolet K2500 5.7L MIL Lamp on
P0171: Fuel Trim System Lean (Bank 1). customer replaced fuel pump before we got involved. long term fuel trims 25% on both banks at idle. Smoked entire intake and found no leaks. Replaced maf twice, no change for better. Wondering if fuel pressure is too low or if injectors are starting to get res...
August 16, 2013
2005 Land Rover LR3 SE 4.4L MIL Lamp on VIN: SALAE25485
P0171: system lean bank a. We have this lr3 and it will set a 171 and 174 at idle without even driving. This was noticed after the park brake module was replaced so we smoke tested all the evap lines and intake and found nothing for vac. leaks. checked and cleaned the maf. Thing is it w...
August 19, 2013
2011 Honda Odyssey EX 3.5L No Start VIN: 5FNRL5H48B
P0171: Fuel system too lean right bank. ... found p0171 and 174, 2nd, check gas for contamination, first sample was dark but, no water was found, second sample was clearer, 3rd sample was good , 3rd we checked the fuel pressure, perfect, then we try to run the engine u...
August 26, 2013