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P0171 Diagnostic Trouble Code Discussion for October 2012

Fuel System Lean (Bank 1)


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Trouble Ticket Help Requests for DTC P0171
Help Request Posted
2001 Ford F-150 Lariat 5.4L Poor Idle Quality, Surge, MIL Lamp on VIN: 1FTRX18L61
P0171: lean fuel trim. ... coolant leak near cyl 1 at crossover (towed in). Vehicle sets p0171 and p0174 after repairs. Fuel trims are high at idle -AND- cruise. Tested fuel pressure, volume and quality-OK. Customer reports no symptoms prior to coolant leak repair. While scanning ...
October 03, 2012
2005 Ford F-250 Super Duty Lariat 5.4L Poor Idle Quality, Stall, Misfire, MIL Lamp on VIN: 1FTSX20585
P0171: lean bank one. ... for but this one has done it! i want to explain everything so please read the entire post. Started out coming to the shop. I was told check engine light is on. pull in shop and check codes. p0171. i check fuel trim at 1800 and at idle and trims total no ...
October 04, 2012
2000 Ford F-150 Lightning 5.4L MIL Lamp on, Lean VIN: 2FTZF0730Y
P0171: System too lean bank 1. ... too lean bank 1, p0401 insufficient egr detected & p1260 theft detected. Dpfe was no good, which fixed p0401. Then reset kam. Truck came back 2 weeks later w/ p0171, so we replaced b1s1 ho2 sensor. 2 weeks later truck came back w/ p0171 & p0174. We...
October 08, 2012
2001 Ford Ranger Edge 3.0L MIL Lamp on VIN: 1FTYR14U91
P0171: Leank Bank 1. ... MODIS Scanner would pickup any other data than its P0171 (ran both KOEO and KOER both didn't show anything other than P0171); cleared codes and the code didn't reappear until approximately 50 miles. Then code reappared and then once code cleared within 3...
October 08, 2012
2003 Chevrolet Express 2500 6.0L Cuts out, Stall VIN: 1GCGG25U63
P0171: Fuel Trim System Lean (Bank 1). The customer has complained that the engine cuts out at idle upon stopping in traffic. It restarts immediately and can cut out before the traffic light turns green but not always. It can cut out this way several times in a trip. I finally got it to act up on m...
October 10, 2012
2003 Chevrolet Express 2500 6.0L Cuts out, Stall VIN: 1GCGG25U63
P0171: Fuel Trim System Lean (Bank 1). The customer has complained that the engine cuts out at idle upon stopping in traffic. It restarts immediately and can cut out before the traffic light turns green but not always. It can cut out this way several times in a trip. I finally got it to act up on m...
October 11, 2012
2005 Ford Focus ZX4 2.0L MIL Lamp on VIN: 1FAFP34N95
P0171: fuel system lean. ... on p0171 fuel system lean. long term fuel trim at 27% short term switching -4/+4%. cleard code and reset KAM. long term went to 0% as expected. went to drive car and short term starts out at 14 to 15% and starts going up from there. seems worse while under...
October 12, 2012
2005 Ford Focus ZX4 2.0L MIL Lamp on VIN: 1FAFP34N95
P0171: fuel system lean. ... on p0171 fuel system lean. long term fuel trim at 27% short term switching -4/+4%. cleard code and reset KAM. long term went to 0% as expected. went to drive car and short term starts out at 14 to 15% and starts going up from there. seems worse while under...
October 15, 2012
2004 Mercury Monterey (Van) 4.2L MIL Lamp on VIN: 2MRDA20294
P0171: bank 1 lean condition. we check for vacuum leak and no luck;originaly was two codes one for lean condition po171 and code for egr.we clean egr passages and replace egr valve.test drove vehicle and code for lean condition come back.I check computer connector for moisture; cleaned and...
October 15, 2012
2002 Ford F-150 XL 4.2L Surge, Poor Fuel Economy, MIL Lamp on VIN: 1FTRX07232
P0171: Lean bank 1. Vehicle came in running rough at times with lean codes. Customer had already installed new upsteam o2s, maf, iac valve and intake gaskets with new bolts/isolaters. STFT both banks max out to +33%, at idle and no change off idle(1500rpm+), indicating no vacuum ...
October 17, 2012
2007 Pontiac G6 2.4L Misfire, MIL Lamp on VIN: 1G2ZG58B17
P0171: Fuel System Lean. ... this 2007 G6 with a trouble code P0171 and P0300 that keeps poping up. I have replaced the cataytic converter do to a trouble code P0420. I know the cat was bad as soon as I saw the O2 sensors on the scanner. Now I have to fix what killed the originl cat. ...
October 23, 2012
2006 Volkswagen Passat 2.0T 2.0L MIL Lamp on VIN: WVWAK93C16
P0171: bank 1 system too lean. We got this vw in 2 days ago with p0171 and p12a2. car ran well did not locate any vacuum leak so replaced rail sensor. Its back same 2 caodes. Checked the circuit again as flow chart suggest. Then checked the fuel pressure it went between 45 and about 55 psi ...
October 26, 2012
2009 Volkswagen Passat CC Luxury 2.0L MIL Lamp on VIN: WVWHL73C59
P0171: lean bank 1. After clearing up the p0171 with the replacement of the oxygen sensor, we then moved on to solve the p12a2. The long term trims are currently around 16.2 Trims were normal at first but quickly rose up. WE have tested for Vacuum leak several times at intake man...
October 27, 2012
2001 Ford Escort ZX2 2.0L Poor Idle Quality, MIL Lamp on VIN: 3FAFP11311
P0171: System lean HO2S11. Ok everyone, another lean code in a Ford and a 4 cyl. this time. Car runs good on road, maybe a very slight intermittent surge at cruise. Idle is erratic, not a single cylinder skip but just erratic. Not really consistent and is worse at times but never really...
October 28, 2012
2005 Chrysler Pacifica Touring 3.5L MIL Lamp on, VIN: 2C8GF68455
P0171: Fuel System Lean (Bank 1). ... HISTORY" SECTION BEFORE READING THIS! THANKS I am chasing this P0171 System lean code. Going off of the timeline stated above, the P0171 has been a problem since the EGR was replaced. The fuel pressure in this vehicle is 58-60 psi KOEO. The Short ter...
October 29, 2012
2001 Ford Escort ZX2 2.0L Poor Idle Quality, MIL Lamp on VIN: 3FAFP11311
P0171: System lean HO2S11. Ok everyone, another lean code in a Ford and a 4 cyl. this time. Car runs good on road, maybe a very slight intermittent surge at cruise. Idle is erratic, not a single cylinder skip but just erratic. Not really consistent and is worse at times but never really...
October 29, 2012
2002 Ford F-150 XL 4.2L MIL Lamp on VIN: 1FTRF17202
P0171: Lean condition. This truck keeps throwing P0171 & 174 codes.HELP!
October 30, 2012
2001 Ford F-150 Lariat 5.4L Poor Idle Quality, Surge, MIL Lamp on VIN: 1FTRX18L61
P0171: lean fuel trim. ... crossover (towed in). Vehicle sets p0171 and p0174 after repairs. Fuel trims are high at idle -AND- cruise. Tested fuel pressure, volume and quality-OK. Customer reports no symptoms prior to coolant leak repair. While scanning ...
October 03, 2012
2005 Ford F-250 Super Duty Lariat 5.4L Poor Idle Quality, Stall, Misfire, MIL Lamp on VIN: 1FTSX20585
P0171: lean bank one. ... want to explain everything so please read the entire post. Started out coming to the shop. I was told check engine light is on. pull in shop and check codes. p0171. i check fuel trim at 1800 and at idle and trims total no ...
October 04, 2012
2000 Ford F-150 Lightning 5.4L MIL Lamp on, Lean VIN: 2FTZF0730Y
P0171: System too lean bank 1. ... egr detected & p1260 theft detected. Dpfe was no good, which fixed p0401. Then reset kam. Truck came back 2 weeks later w/ p0171, so we replaced b1s1 ho2 sensor. 2 weeks later truck came back w/ p0171 & p0174. We...
October 08, 2012
2001 Ford Ranger Edge 3.0L MIL Lamp on VIN: 1FTYR14U91
P0171: Leank Bank 1. ... MODIS Scanner would pickup any other data than its P0171 (ran both KOEO and KOER both didn't show anything other than P0171); cleared codes and the code didn't reappear until approximately 50 miles. Then code reappared and then once code cleared within 3...
October 08, 2012
2003 Chevrolet Express 2500 6.0L Cuts out, Stall VIN: 1GCGG25U63
P0171: Fuel Trim System Lean (Bank 1). The customer has complained that the engine cuts out at idle upon stopping in traffic. It restarts immediately and can cut out before the traffic light turns green but not always. It can cut out this way several times in a trip. I finally got it to act up on m...
October 10, 2012
2003 Chevrolet Express 2500 6.0L Cuts out, Stall VIN: 1GCGG25U63
P0171: Fuel Trim System Lean (Bank 1). The customer has complained that the engine cuts out at idle upon stopping in traffic. It restarts immediately and can cut out before the traffic light turns green but not always. It can cut out this way several times in a trip. I finally got it to act up on m...
October 11, 2012
2005 Ford Focus ZX4 2.0L MIL Lamp on VIN: 1FAFP34N95
P0171: fuel system lean. ... on p0171 fuel system lean. long term fuel trim at 27% short term switching -4/+4%. cleard code and reset KAM. long term went to 0% as expected. went to drive car and short term starts out at 14 to 15% and starts going up from there. seems worse while under...
October 12, 2012
2005 Ford Focus ZX4 2.0L MIL Lamp on VIN: 1FAFP34N95
P0171: fuel system lean. ... on p0171 fuel system lean. long term fuel trim at 27% short term switching -4/+4%. cleard code and reset KAM. long term went to 0% as expected. went to drive car and short term starts out at 14 to 15% and starts going up from there. seems worse while under...
October 15, 2012
2004 Mercury Monterey (Van) 4.2L MIL Lamp on VIN: 2MRDA20294
P0171: bank 1 lean condition. we check for vacuum leak and no luck;originaly was two codes one for lean condition po171 and code for egr.we clean egr passages and replace egr valve.test drove vehicle and code for lean condition come back.I check computer connector for moisture; cleaned and...
October 15, 2012
2002 Ford F-150 XL 4.2L Surge, Poor Fuel Economy, MIL Lamp on VIN: 1FTRX07232
P0171: Lean bank 1. Vehicle came in running rough at times with lean codes. Customer had already installed new upsteam o2s, maf, iac valve and intake gaskets with new bolts/isolaters. STFT both banks max out to +33%, at idle and no change off idle(1500rpm+), indicating no vacuum ...
October 17, 2012
2007 Pontiac G6 2.4L Misfire, MIL Lamp on VIN: 1G2ZG58B17
P0171: Fuel System Lean. ... this 2007 G6 with a trouble code P0171 and P0300 that keeps poping up. I have replaced the cataytic converter do to a trouble code P0420. I know the cat was bad as soon as I saw the O2 sensors on the scanner. Now I have to fix what killed the originl cat. ...
October 23, 2012
2006 Volkswagen Passat 2.0T 2.0L MIL Lamp on VIN: WVWAK93C16
P0171: bank 1 system too lean. We got this vw in 2 days ago with p0171 and p12a2. car ran well did not locate any vacuum leak so replaced rail sensor. Its back same 2 caodes. Checked the circuit again as flow chart suggest. Then checked the fuel pressure it went between 45 and about 55 psi ...
October 26, 2012
2009 Volkswagen Passat CC Luxury 2.0L MIL Lamp on VIN: WVWHL73C59
P0171: lean bank 1. After clearing up the p0171 with the replacement of the oxygen sensor, we then moved on to solve the p12a2. The long term trims are currently around 16.2 Trims were normal at first but quickly rose up. WE have tested for Vacuum leak several times at intake man...
October 27, 2012
2001 Ford Escort ZX2 2.0L Poor Idle Quality, MIL Lamp on VIN: 3FAFP11311
P0171: System lean HO2S11. Ok everyone, another lean code in a Ford and a 4 cyl. this time. Car runs good on road, maybe a very slight intermittent surge at cruise. Idle is erratic, not a single cylinder skip but just erratic. Not really consistent and is worse at times but never really...
October 28, 2012
2005 Chrysler Pacifica Touring 3.5L MIL Lamp on, VIN: 2C8GF68455
P0171: Fuel System Lean (Bank 1). ... HISTORY" SECTION BEFORE READING THIS! THANKS I am chasing this P0171 System lean code. Going off of the timeline stated above, the P0171 has been a problem since the EGR was replaced. The fuel pressure in this vehicle is 58-60 psi KOEO. The Short ter...
October 29, 2012
2001 Ford Escort ZX2 2.0L Poor Idle Quality, MIL Lamp on VIN: 3FAFP11311
P0171: System lean HO2S11. Ok everyone, another lean code in a Ford and a 4 cyl. this time. Car runs good on road, maybe a very slight intermittent surge at cruise. Idle is erratic, not a single cylinder skip but just erratic. Not really consistent and is worse at times but never really...
October 29, 2012
2002 Ford F-150 XL 4.2L MIL Lamp on VIN: 1FTRF17202
P0171: Lean condition. This truck keeps throwing P0171 & 174 codes.HELP!
October 30, 2012