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P0171 Diagnostic Trouble Code Discussion for December 2012

Fuel System Lean (Bank 1)

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Trouble Ticket Help Requests for DTC P0171
Help Request Posted
1994 Saab 900 S 2.3L MIL Lamp on VIN: YS3DC58B6R
P0171: Lean Mixture. This is my own trusty NG900S. Code P0171 appears intermittently for a brief, but MIL stays on. The code apears only at normal operating temperature and idle speed, either after cruising or in less then 2 seconds after a hot start. Drove the car with T2 engaged...
December 01, 2012
2010 Toyota Prius 1.8L Poor Idle Quality, Stall, MIL Lamp on
P0171: system lean. I eliminated the following by using a known good part: map, maf sensors. I pinched off the purge vsv and pcv to eliminate them as a vacuum leak. when I spray carb cleaner into the intake plenum the engine runs smooth. the long term fuel is at 30% and the short...
December 13, 2012
2006 Toyota Corolla S 1.8L MIL Lamp on VIN: 1NXBR32E06
P0171: Fuel System Too Lean (Bank 1). Hi and thanks for looking at this for me! I usually do NOT touch Jap cars but got suckered into this one. My question is all F/T values appear good i.e. long & short (10% BUT O2F/T 96.3% I have never seen O2FT before all I can find out is that it's the sa...
December 19, 2012
2005 Volkswagen Jetta 2.5 2.5L Poor Idle Quality, Surge, Misfire, MIL Lamp on VIN: 3VWSF71K25
P0171: too lean B1. this post is to help with a drive way fix/repair so you can see if there are other things going on. typical of the VW breather system you get internal vacum leak, and on this eng [2.5L] vale cover needs to be replaced. I used a PCV valve [ I found in the used ...
December 19, 2012
2004 Ford F-150 FX4 5.4L MIL Lamp on VIN: 1FTPX14534
P0171: System lean bank 1. ... Scan revealed a p0171, system lean bank 1. Looked at fuel trims on my scan tool. Fuel trims showed ltft bank one pinned at thirty at idle. All others were plus or minus 5. When vehicle is driven all fuel trims are normal. Smoked intake with no leaks found....
December 20, 2012
2001 BMW 330i 3.0L MIL Lamp on VIN: WBAAV534X1
P0171: Lean condition bank1. Car was recently purchased from individual who claimed CEL was never on. Customer drove home and next day when driving to work, CEL came on.Diagnostic tests showed lean on both banks. Ran smoke test to check for vac leaks- found air boot to be cracked.Replaced...
December 26, 2012