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P0171 Diagnostic Trouble Code Discussion for September 2011

Fuel System Lean (Bank 1)


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Trouble Ticket Help Requests for DTC P0171
Help Request Posted
2007 Ford F-150 FX4 5.4L MIL Lamp on VIN: 1FTPW14V97
P0171: bank lean. engine lite on computor check found po171 and po174 codes both banks lean checked wiring found no problems ---checked for vbacuum leaks installed smook machine foumnd no vacuum leaks. the only thing that i had a question about is that they installed an after m...
September 01, 2011
2000 Mercury Sable GS 3.0L Misfire, MIL Lamp on VIN: 1MEFM55S5Y
P0171: cylinder 2 misfire. thanks in advance,replaced spark plugs,ignition coil #2, repair vacuum leak egr gasket, fuel filter.this is the only leak found with smoke machine. misfire noticeable. clear code. next day all code came back.i am not workig on trans code po741 yet. i want to f...
September 02, 2011
2006 Ford E-250 5.4L Vacuum problem VIN: 1FTNF20516
P0171: Lean. We need help, BIG TIME HELP This F250 received new spark plugs here about 4 weeks ago, about a week after the plug replacement the guy comes in with a check engine light and a noticeable wining sound coming from the engine, I pulled the codes and it was lean ...
September 07, 2011
2003 Pontiac Vibe GT 1.8L Hesitation, MIL Lamp on VIN: 5Y2SN64L23
P0171: Fuel Trim System Lean. car has been coming up with code p0171 on and off for about a year now. has been checked at other shops but doesn't sound like anything has been found ever or replaced. car runs ok but does have slight hesitation only intermittantly when under light throttle a...
September 09, 2011
2005 Ford Excursion XLT 6.8L MIL Lamp on VIN: 1F1NU40S45
P0171: Bank 1 system too lean. ... this one. Vehicle came in the shop for the check engine light coming on. Has only one code the P0171. The truck runs great, it has no noticeable driveability problems. The fuel trim though is way off the mark. @ idle LTFT1:16% LTFT2:-15% STFT1:1-16 STFT2:-...
September 12, 2011
2004 Suzuki Verona LX 2.5L Poor Idle Quality VIN: KL5VJ52LX4
P0171: Fuel System Too Lean (Bank 1). The Long Term Fuel Trim Alaways High At Idle
September 15, 2011
2005 Ford Explorer XLT 4.0L Poor Idle Quality VIN: 1FMZU73K45
P0171: system rich bank 2. im haveing a problem understanding ford ffv system. how does this operating sys know when e85 is in tank? I didnt see and ffv sensor. the issue is only when e85 is in tank, and after a hot short soak, the info i found out of spec is evap purge @0% but evap sys...
September 17, 2011
2001 Cadillac DeVille 4.6L Stall, MIL Lamp on VIN: 1G6KD54Y21
P0171: Fuel Trim System Lean (Bank 1). ... work on GM's, we are a Toyota dealer, try telling that to our management...lol. Customer states that the Service Engine Soon light came on and car cut off while driving. DTC's P0171 and P0174 are stored in PCM. Vehicle see...
September 20, 2011
1997 Ford Ranger XL 2.3L MIL Lamp on VIN: 1FTCR10A7V
P0171: System lean bank no. 1. ... are haveing at the shop. P0171 engine code came up, we performed a smoke test found the leak comeing from the egr valve and idle air valve, we replaced them with new parts twice already but even the new parts are leaking as well, smoke coming from bottom o...
September 21, 2011
2005 Chrysler PT Cruiser Touring 2.4L Excessive Emissions, Hesitation, MIL Lamp on VIN: 3C3EY55E95
P0171: Fuel System Lean. ... fairly hard hesitation and code P0171. (Lean bank 1) We have all data and went through their pin point test. We tested and replaced parts as necessarry. Checked vacuum leaks. The turbo seems to work well. I was wondering about the waste gate as I am not th...
September 22, 2011
2000 Ford E-350 Econoline XL 6.8L MIL Lamp on VIN: 1FTSS34S2Y
P0171: Bank 1 lean. Help!!! we have this 2000 ford e-350 news van that has got us to the point of being commited. This van only sets the codes at idle in gear. Long term trim goes to positive 12% and short term goes to 33.3%. Have done multiple smoke tests at different points aro...
September 22, 2011
2005 Ford E-250 5.4L running lean VIN: 1FTNE24L05
P0171: System lean bank 1. Vehicle is setting lean codes. When I block off the pcv port, at the manifold, my fuel trims start to drop. The pcv hose is the completely plastic one and has no holes anywhere. I smoked out the system, and the only place the smoke comes out is a rather large ...
September 22, 2011
2000 Ford E-350 Econoline XL 6.8L MIL Lamp on VIN: 1FTSS34S2Y
P0171: Bank 1 lean. Help!!! we have this 2000 ford e-350 news van that has got us to the point of being commited. This van only sets the codes at idle in gear. Long term trim goes to positive 12% and short term goes to 33.3%. Have done multiple smoke tests at different points aro...
September 23, 2011
2006 BMW X3 3.0i 3.0L Poor Idle Quality, P0171 & p0174 VIN: WXPA93496W
P0171: Lean. Checking for intermitent codes p0171 and po174,lean bank 1 and 2. No obvious vacuum leaks. Check pcv system via of a flow chart designated to these codes. Check vaccum at oil dipstick, should be 1/4 to 1/2 inches of vaccum. Vacuum is 10 inches at dipstick and ...
September 27, 2011
1998 Lexus ES300 3.0L MIL Lamp on VIN: JT88F28G1W
P0171: Fuel System Too Lean (Bank 1). ... code p0171, after checking for no vacuum leaks, in pcv system, brake booster and smoke test...Customer return after one week. Rescan and found code p0171. Freeze frame. 750 rpm , 0mph. long term bank 1 and bank 2 35% in close loop. Clear code and drive and...
September 29, 2011
1998 Lexus ES300 3.0L MIL Lamp on VIN: JT88F28G1W
P0171: Fuel System Too Lean (Bank 1). ... code p0171, after checking for no vacuum leaks, in pcv system, brake booster and smoke test...Customer return after one week. Rescan and found code p0171. Freeze frame. 750 rpm , 0mph. long term bank 1 and bank 2 35% in close loop. Clear code and drive and...
September 30, 2011
2000 Toyota Celica GT 1.8L Hesitation, Misfire, MIL Lamp on VIN: JTDDR32T14
P0171: Fuel System Too Lean (Bank 1). This vehicle has come in, customer complaining of MIL. Vehicle hesitates very badly under load and has very rough idle. Went ahead and swapped all the plus and coils around and cleared the MIL to isolate a cylinder, seems cylinder 3 is having the most misfires...
September 30, 2011