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P0171 Diagnostic Trouble Code Discussion for November 2007

Fuel System Lean (Bank 1)


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Trouble Ticket Help Requests for DTC P0171
Help Request Posted
2000 Chevrolet Express 3500 5.7L Misfire VIN: 1GHC39R3Y1
P0171: Fuel Trim System Lean (Bank 1). Alright guys, this van has a misfire on cylinders 2,4,8 at idle. Above idle it runs fine. I was thinking vacuum leak or fuel leakege so i was about to take the intake off but i was thinking I would get a second opinion first. It also runs rough cold than hot. ...
November 01, 2007
2000 Mercury Sable GS 3.0L MIL Lamp on VIN: 1MEFM55SOY
P0171: bank 1 lean. Hi everyone. I feel like it's my week in the boxing ring, so here we go. This vehicle came in with the above codes stored for lean exh. Problem is occurring at idle and set fuel trims at around 30% ST and 20% LT after idling approx. 1 min. like this suddenly f...
November 02, 2007
2000 Chevrolet Express 3500 5.7L Misfire VIN: 1GHC39R3Y1
P0171: Fuel Trim System Lean (Bank 1). Alright guys, this van has a misfire on cylinders 2,4,8 at idle. Above idle it runs fine. I was thinking vacuum leak or fuel leakege so i was about to take the intake off but i was thinking I would get a second opinion first. It also runs rough cold than hot. ...
November 03, 2007
2000 Toyota Corolla VE 1.8L Poor Idle Quality, Surge, Stall VIN: 2T1BR12E2Y
P0171: Fuel System Too Lean (Bank 1). ... a complaint of erratic idle and stalling. Upon inspection, P0171 (B1 Lean) code was read. This code is fairly common on this model and as such, a MAF was replaced due to known contamination and failure issues. Needless to say, there was no improvement on t...
November 05, 2007
2001 Audi TT 1.8L MIL Lamp on VIN: TRUWX28N31
P0171: bank 1 system lean. our monitor would only let us go into global on this intermittant service light(genysis)car runs good and light comes on at times. we are looking at replacing the o/2 sensor. at times it switchs .it has a po171b code.cannot find any info.any feedback would be ...
November 06, 2007
2001 Nissan Sentra GXE 1.8L Excessive Emissions, Cuts out, Misfire, MIL Lamp on VIN: 3N1CB51D01
P0171: Fuel Trim Lean. Greetings and thanks for reading, this one came in with poor performance and code. We replaced plugs and ran a good FI service. This made the car run real good. Customer was very pleased with that, but, the trims were still off. Alpha at idle was 94, and at 20...
November 06, 2007
2000 Toyota Corolla VE 1.8L Poor Idle Quality, Surge, Stall VIN: 2T1BR12E2Y
P0171: Fuel System Too Lean (Bank 1). ... a complaint of erratic idle and stalling. Upon inspection, P0171 (B1 Lean) code was read. This code is fairly common on this model and as such, a MAF was replaced due to known contamination and failure issues. Needless to say, there was no improvement on t...
November 10, 2007
1997 Toyota Tacoma DLX 2.7L MIL Lamp on VIN: 4TAPM62N3V
P0171: Fuel System Too Lean (Bank 1). My question involves the fuel pressure regulator. the vacuum line seems to be hooked up correctly, but their is no vacuum to the regulator. If anyone knows if this is normal or a problem of some type please respond. asap
November 12, 2007
1998 Toyota Avalon XL 3.0L Excessive Emissions, Poor Idle Quality, Misfire, MIL Lamp on VIN: 4T1BF18B2W
P0171: Fuel System Too Lean (Bank 1). goodday to all my fellow technicians out there. this vehicle has been in my shop approx. 4 times all related to the same po171 code. after a few days of driving locally the vehicle seems to have all the same symptoms after any related repairs are made. exhaust...
November 12, 2007
1998 Toyota Avalon XL 3.0L Excessive Emissions, Poor Idle Quality, Misfire, MIL Lamp on VIN: 4T1BF18B2W
P0171: Fuel System Too Lean (Bank 1). goodday to all my fellow technicians out there. this vehicle has been in my shop approx. 4 times all related to the same po171 code. after a few days of driving locally the vehicle seems to have all the same symptoms after any related repairs are made. exhaust...
November 14, 2007
1998 Toyota Camry CE 2.2L Surge VIN: 4T1BG22K5W
P0171: Fuel System Too Lean (Bank 1). Hi guy's. I have a 98 toyota camry with code po171 system lean, WE can't find any vacumm leaks. replaced air/fuel sensor. Tuned up car. still get same code, and now have a driveability problem to. At a steady speed car starts to surge. Not a skip ,just surges ...
November 19, 2007
1999 Volvo S70 2.4L MIL Lamp on VIN: YV1LS55A9X
P0171: bank 1system too lean. ... codes p0171 system too lean and p0136 o2 htr circuit bank one snesor one we changed the mass air flow and the o2 sensor ,ran the car for readiness came back with the p0171 we found vacum leak at the air box ,we fix it and took it on the hwy came back with ...
November 19, 2007
2001 Kia Sportage 2.0L MIL Lamp on VIN: KNDJB72361
P0171: Fuel System Too Lean (Bank 1). ... The first two trys to read codes came up with no codes present, the third showed P0171. Again at idle, intermittantly the MAF grams/sec reading goes crazy, up to 350, the trims also go way up 100%. I would not expect two bad reman MAF sensors. Any ideas?
November 20, 2007
1998 Toyota Camry CE 2.2L Surge VIN: 4T1BG22K5W
P0171: Fuel System Too Lean (Bank 1). Hi guy's. I have a 98 toyota camry with code po171 system lean, WE can't find any vacumm leaks. replaced air/fuel sensor. Tuned up car. still get same code, and now have a driveability problem to. At a steady speed car starts to surge. Not a skip ,just surges ...
November 25, 2007
2001 Ford Escort SE 2.0L Poor Idle Quality, Hesitation, Stall, MIL Lamp on VIN: 3FAFP13P31
P0171: memory lean. Hi everybody and thanks in advance for looking at this this one has me stumped I checked the mass a/f and it consistantly gives a low air flow reading, checked for vacum leaks at the intake disconected the vacum lines and pluged with no change in maf voltage. ...
November 26, 2007
2001 Ford F-150 XL 4.2L MIL Lamp on VIN: 1FT2X07271
P0171: Bank 1 lean. Help, Iam not at home this is a in laws vehicle,I borrowed vacuum and fuel gauges and generic scan tool. I am on the road, looked at a couple plugs and tips look lean but bases have carbon build up,No unmetered air i can see,sprayed some carb cleaner around ma...
November 26, 2007
2006 Chevrolet Impala LT 3.5L MIL Lamp on VIN: 2G1WT58K36
P0171: Fuel System Lean. Car came shifing hard with the check engine light on. It had a PO171 lean code. The long term fuel trim was fixed at 19.5%. The MAF sensor would change is reading at idle intermittently. The car would also reset the lean code within a couple minutes. I have ne...
November 27, 2007
2001 Toyota Camry LE 2.2L MIL Lamp on VIN: JT2BG22K91
P0171: Fuel System Too Lean (Bank 1). hello fellow techs , i have this toyota camry that keeps setting a po171 fuel system lean bank 1 intermittently . used mastertech with toyota software to scan data . long term fuel trim at 39% . followed po171 flow chart . only thing is fuel pressure a little ...
November 27, 2007
1999 Chevrolet Cavalier 2.2L Hesitation, Surge, MIL Lamp on VIN: 3G1JC5244X
P0171: Fuel System Lean (Bank 1). this one has us stumped. Originally believed we started off with just a vacuum leak at the intake manifold gasket, was able to spray carb cleaner at corner off manifold and change o2/fuel trim reading. But still running lean after repair. We can drip carb clea...
November 28, 2007
2001 Toyota Camry LE 2.2L MIL Lamp on VIN: JT2BG22K91
P0171: Fuel System Too Lean (Bank 1). hello fellow techs , i have this toyota camry that keeps setting a po171 fuel system lean bank 1 intermittently . used mastertech with toyota software to scan data . long term fuel trim at 39% . followed po171 flow chart . only thing is fuel pressure a little ...
November 28, 2007
2006 Chevrolet Impala LT 3.5L MIL Lamp on VIN: 2G1WT58K36
P0171: Fuel System Lean. Car came shifing hard with the check engine light on. It had a PO171 lean code. The long term fuel trim was fixed at 19.5%. The MAF sensor would change is reading at idle intermittently. The car would also reset the lean code within a couple minutes. I have ne...
November 29, 2007
2000 Ford Explorer Sport 4.0L Poor Idle Quality, Hesitation, Surge, Stall, Misfire VIN: 1FMYU70E5Y
P0171: bank 1 lean. ... without asking for help, but it has me stumped. First of all keep in mind that this is the new generation 4.0L V-6 SOHC with a plastic intake manifold. On cold start only it hesitates and seems to starve for fuel badly. If you hold the throttle open and al...
November 29, 2007