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P0171 Diagnostic Trouble Code Discussion for January 2013

Fuel System Lean (Bank 1)


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Trouble Ticket Help Requests for DTC P0171
Help Request Posted
2001 Dodge Ram 1500 Van 5.2L Hesitation, Misfire, MIL Lamp on VIN: 3B7HC13Y61
P0171: Fuel System Lean (Bank 1). ... me in weird ways. came in for state inspection and found that the check engine light was on. pulled codes and came up with p0171 and po301. engine is running great. customer stated that sometimes its a real pain to start b...
January 03, 2013
2003 Toyota Tacoma Pre Runner 3.4L Excessive Emissions, Poor Fuel Economy, MIL Lamp on
P0171: Fuel System Too Lean (Bank 1). ... the MIL and mileage will go from around 18 MPGs to about 10 MPG. Puffs of black smoke can be seen coming out of the tailpipe sometimes while this is happening. This is only when he travels north to higher elevations. Any other direction and there is no pro...
January 04, 2013
2002 Saturn Vue 3.0L MIL Lamp on VIN: 5GZCZ63B42
P0171: Fuel Trim System Lean (Bank 1). throws lean codes both banks, however fuel trim is running negative on long and short term in freeze frame . live data fuel trim is around zero ,back and forth,pos-negative
January 10, 2013
2000 Chevrolet Express 3500 LS 5.7L MIL Lamp on VIN: 1GBJG31R7Y
P0171: Fuel Trim System Lean (Bank 1). ... a P0171 bank one system lean. Smoke test on intake was ok. Fuel pressure at 60psi and it will hold there at wide open throttle. Checked cat with a bore scope and both sides are clean, no obvious restriction. purge valve ok. Spark plugs replaced. This is ...
January 11, 2013
2005 Volkswagen Jetta GL 2.0L MIL Lamp on VIN: 3VWRA69M15
P0171: Bank 1 Lean. ... a check engine light. Codes found were 16555 (Po171) Fuel system lean bank 1 and P0101 MAF sensor implausible signal. Found the MAF to not be putting out the correct numbers and replaced the MAF. The car came back a couple weeks later with the same code. F...
January 11, 2013
2000 Dodge Intrepid 2.7L No Start, Poor Idle Quality, Hesitation, Stall, Misfire VIN: 2B3HD46R4Y
P0171: Fuel System Lean (Bank 1). Thanks to all reading this. I am really in the weeds on this one. I inheritted this car from a coworker after he spent a couple of days getting nowhere. When the car came in as a no start shortly after getting gas, we were able to get it started and limp into ...
January 12, 2013
2005 Volkswagen Jetta GL 2.0L MIL Lamp on VIN: 3VWRA69M15
P0171: Bank 1 Lean. ... a check engine light. Codes found were 16555 (Po171) Fuel system lean bank 1 and P0101 MAF sensor implausible signal. Found the MAF to not be putting out the correct numbers and replaced the MAF. The car came back a couple weeks later with the same code. F...
January 14, 2013
2000 Chevrolet Express 3500 LS 5.7L MIL Lamp on VIN: 1GBJG31R7Y
P0171: Fuel Trim System Lean (Bank 1). ... a P0171 bank one system lean. Smoke test on intake was ok. Fuel pressure at 60psi and it will hold there at wide open throttle. Checked cat with a bore scope and both sides are clean, no obvious restriction. purge valve ok. Spark plugs replaced. This is ...
January 15, 2013
2004 Dodge Ram 2500 Truck ST 5.7L Excessive Emissions, MIL Lamp on, Rich VIN: 1D7KU28D14
P0171: Fuel System Lean (Bank 1). This Dodge Hemi is a tough one! The customer called that the truck was running pig rich, enough that it makes your eyes water, and pushing black smoke. I asked if the Check Engine light was on, and he said yes. Shouldn't be too tough, I thought. I wish. I hoo...
January 18, 2013
2010 Ford F-150 XL 4.6L Hesitation VIN: 1FTEW1E80A
P0171: running lean. I am posting this to hopefully help the next poor guy that has this. The customer brought in his 2010 f150 with 41000 kms on it for regular maintenance. The engine had a code for running lean ( i think?),we looked around and found out the air intake tube from ...
January 18, 2013
2003 Toyota Tacoma Pre Runner 2.7L MIL Lamp on VIN: 5TENM92N83
P0171: Fuel System Too Lean (Bank 1). ... Check engine light on with p0171. They installed mass air flow sensor from toyota. And air fuel ration sensor. He thinks the air fuel ration sensor came from after market supplier. He wasn't sure (which is odd) and i can't see any name or number anywhere o...
January 19, 2013
2003 GMC Envoy XL SLT 5.3L Poor Idle Quality, Stall, Misfire, MIL Lamp on VIN: 1GKET16P93
P0171: Fuel System Lean (Bank 1). Stumped again. This Envoy idles terrible and even dies out at idle sometimes. Both upstream 02s run at about 40 -60 mv. Soon as I touch the throttle they respond and go to 800 -900mv and they start responding perfectly. Fuel trims at idle are above 50 but I ca...
January 20, 2013
2006 Ford F-150 XLT 5.4L MIL Lamp on, Lean exhaust VIN: 1FTPX14536
P0171: System too lean bank 1. Customer stated that light would come on during longer trips finaly brought in in for us to check. Maf sensor had recently been replaced ,checked freeze frame data and found long term fuel trim at 25% and 29.7% short term was 13.3 and 11.7 no vacuum leaks were...
January 23, 2013
2004 Chevrolet Tracker 2.5L Poor Idle Quality, Misfire, MIL Lamp on VIN: 2CNBJ13494
P0171: Lean bank 1. Vehicle runs rough at idle and has p0171 code for bank 1 lean.fuel trim reading -15 to -29 on one bank.checked for vacuum leaks-none found, b1s1 o2 replaced for being lazy.plugs are new,replace with other new ones just to make sure. All associated sensors read...
January 24, 2013
2001 BMW X5 4.4i 4.4L Hesitation, Cuts out, MIL Lamp on VIN: WBAFB33551
P0171: System too Lean Bank 1. ... for codes; has code p0171 and p0174-system too lean both banks 1 & 2. Hooked smoke machine up. No leaks found cold. Test drove around block and vehicle has no power if WOT. If gas pedal is pressed down slowly, car will ...
January 25, 2013
2001 BMW X5 4.4i 4.4L Hesitation, Cuts out, MIL Lamp on VIN: WBAFB33551
P0171: System too Lean Bank 1. ... for codes; has code p0171 and p0174-system too lean both banks 1 & 2. Hooked smoke machine up. No leaks found cold. Test drove around block and vehicle has no power if WOT. If gas pedal is pressed down slowly, car will ...
January 28, 2013
2000 Ford Expedition XLT 5.4L MIL Lamp on VIN: 1FMPU16L8Y
P0171: Bank 1 too lean. ... Smoke test cold showed intake seals,iac,egr leak.replaced with oe. Maf was dirty. Replaced it with reman. Oxygen sensors were oe and very sluggish. Replaced with oe. Cleaned injectors twice with motorvac. Intake looked ok when i had it off. Ran great on tw...
January 29, 2013
2001 Dodge Ram 1500 Van 5.2L Hesitation, Misfire, MIL Lamp on VIN: 3B7HC13Y61
P0171: Fuel System Lean (Bank 1). ... me in weird ways. came in for state inspection and found that the check engine light was on. pulled codes and came up with p0171 and po301. engine is running great. customer stated that sometimes its a real pain to start b...
January 03, 2013
2003 Toyota Tacoma Pre Runner 3.4L Excessive Emissions, Poor Fuel Economy, MIL Lamp on
P0171: Fuel System Too Lean (Bank 1). ... the MIL and mileage will go from around 18 MPGs to about 10 MPG. Puffs of black smoke can be seen coming out of the tailpipe sometimes while this is happening. This is only when he travels north to higher elevations. Any other direction and there is no pro...
January 04, 2013
2002 Saturn Vue 3.0L MIL Lamp on VIN: 5GZCZ63B42
P0171: Fuel Trim System Lean (Bank 1). throws lean codes both banks, however fuel trim is running negative on long and short term in freeze frame . live data fuel trim is around zero ,back and forth,pos-negative
January 10, 2013
2000 Chevrolet Express 3500 LS 5.7L MIL Lamp on VIN: 1GBJG31R7Y
P0171: Fuel Trim System Lean (Bank 1). ... a P0171 bank one system lean. Smoke test on intake was ok. Fuel pressure at 60psi and it will hold there at wide open throttle. Checked cat with a bore scope and both sides are clean, no obvious restriction. purge valve ok. Spark plugs replaced. This is ...
January 11, 2013
2005 Volkswagen Jetta GL 2.0L MIL Lamp on VIN: 3VWRA69M15
P0171: Bank 1 Lean. ... a check engine light. Codes found were 16555 (Po171) Fuel system lean bank 1 and P0101 MAF sensor implausible signal. Found the MAF to not be putting out the correct numbers and replaced the MAF. The car came back a couple weeks later with the same code. F...
January 11, 2013
2000 Dodge Intrepid 2.7L No Start, Poor Idle Quality, Hesitation, Stall, Misfire VIN: 2B3HD46R4Y
P0171: Fuel System Lean (Bank 1). Thanks to all reading this. I am really in the weeds on this one. I inheritted this car from a coworker after he spent a couple of days getting nowhere. When the car came in as a no start shortly after getting gas, we were able to get it started and limp into ...
January 12, 2013
2005 Volkswagen Jetta GL 2.0L MIL Lamp on VIN: 3VWRA69M15
P0171: Bank 1 Lean. ... a check engine light. Codes found were 16555 (Po171) Fuel system lean bank 1 and P0101 MAF sensor implausible signal. Found the MAF to not be putting out the correct numbers and replaced the MAF. The car came back a couple weeks later with the same code. F...
January 14, 2013
2000 Chevrolet Express 3500 LS 5.7L MIL Lamp on VIN: 1GBJG31R7Y
P0171: Fuel Trim System Lean (Bank 1). ... a P0171 bank one system lean. Smoke test on intake was ok. Fuel pressure at 60psi and it will hold there at wide open throttle. Checked cat with a bore scope and both sides are clean, no obvious restriction. purge valve ok. Spark plugs replaced. This is ...
January 15, 2013
2004 Dodge Ram 2500 Truck ST 5.7L Excessive Emissions, MIL Lamp on, Rich VIN: 1D7KU28D14
P0171: Fuel System Lean (Bank 1). This Dodge Hemi is a tough one! The customer called that the truck was running pig rich, enough that it makes your eyes water, and pushing black smoke. I asked if the Check Engine light was on, and he said yes. Shouldn't be too tough, I thought. I wish. I hoo...
January 18, 2013
2010 Ford F-150 XL 4.6L Hesitation VIN: 1FTEW1E80A
P0171: running lean. I am posting this to hopefully help the next poor guy that has this. The customer brought in his 2010 f150 with 41000 kms on it for regular maintenance. The engine had a code for running lean ( i think?),we looked around and found out the air intake tube from ...
January 18, 2013
2003 Toyota Tacoma Pre Runner 2.7L MIL Lamp on VIN: 5TENM92N83
P0171: Fuel System Too Lean (Bank 1). ... Check engine light on with p0171. They installed mass air flow sensor from toyota. And air fuel ration sensor. He thinks the air fuel ration sensor came from after market supplier. He wasn't sure (which is odd) and i can't see any name or number anywhere o...
January 19, 2013
2003 GMC Envoy XL SLT 5.3L Poor Idle Quality, Stall, Misfire, MIL Lamp on VIN: 1GKET16P93
P0171: Fuel System Lean (Bank 1). Stumped again. This Envoy idles terrible and even dies out at idle sometimes. Both upstream 02s run at about 40 -60 mv. Soon as I touch the throttle they respond and go to 800 -900mv and they start responding perfectly. Fuel trims at idle are above 50 but I ca...
January 20, 2013
2006 Ford F-150 XLT 5.4L MIL Lamp on, Lean exhaust VIN: 1FTPX14536
P0171: System too lean bank 1. Customer stated that light would come on during longer trips finaly brought in in for us to check. Maf sensor had recently been replaced ,checked freeze frame data and found long term fuel trim at 25% and 29.7% short term was 13.3 and 11.7 no vacuum leaks were...
January 23, 2013
2004 Chevrolet Tracker 2.5L Poor Idle Quality, Misfire, MIL Lamp on VIN: 2CNBJ13494
P0171: Lean bank 1. Vehicle runs rough at idle and has p0171 code for bank 1 lean.fuel trim reading -15 to -29 on one bank.checked for vacuum leaks-none found, b1s1 o2 replaced for being lazy.plugs are new,replace with other new ones just to make sure. All associated sensors read...
January 24, 2013
2001 BMW X5 4.4i 4.4L Hesitation, Cuts out, MIL Lamp on VIN: WBAFB33551
P0171: System too Lean Bank 1. ... for codes; has code p0171 and p0174-system too lean both banks 1 & 2. Hooked smoke machine up. No leaks found cold. Test drove around block and vehicle has no power if WOT. If gas pedal is pressed down slowly, car will ...
January 25, 2013
2001 BMW X5 4.4i 4.4L Hesitation, Cuts out, MIL Lamp on VIN: WBAFB33551
P0171: System too Lean Bank 1. ... for codes; has code p0171 and p0174-system too lean both banks 1 & 2. Hooked smoke machine up. No leaks found cold. Test drove around block and vehicle has no power if WOT. If gas pedal is pressed down slowly, car will ...
January 28, 2013
2000 Ford Expedition XLT 5.4L MIL Lamp on VIN: 1FMPU16L8Y
P0171: Bank 1 too lean. ... Smoke test cold showed intake seals,iac,egr leak.replaced with oe. Maf was dirty. Replaced it with reman. Oxygen sensors were oe and very sluggish. Replaced with oe. Cleaned injectors twice with motorvac. Intake looked ok when i had it off. Ran great on tw...
January 29, 2013