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P0171 Diagnostic Trouble Code Discussion for August 2006

Fuel System Lean (Bank 1)


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Trouble Ticket Help Requests for DTC P0171
Help Request Posted
2001 Kia Sportage 2.0L MIL Lamp on VIN: KNDJB62381
P0171: Fuel System Too Lean (Bank 1). ... ones this past couple of weeks... This Kia currently is setting a P0171 Bank 1 system too lean... The thing that is confusing me is that acording to both Mitchell and AllData the code will set after is in closed loop and fuel trim is @ 23%, it is a two tri...
August 01, 2006
2000 Infiniti I30 3.0L Hesitation, MIL Lamp on VIN: JNKCA31A2Y
P0171: Fuel Trim Lean (Bank 1). WE have this Infiniti here that exhibited all the symptoms of a bad MAF sensor. We installed an updated one with housing from Nissan. We definitely improved the MAF gms/sec readings and the car runs better but now it is obviously rich. My question is, does the...
August 02, 2006
2002 Toyota Tundra SR5 4.7L MIL Lamp on VIN: 5BRT38112S
P0171: Fuel System Too Lean (Bank 1). Came in with MIL light on. Recorded codes and snap shot data. Both long term trim #s are 34.3% both short term vary at idle 6.9%-10% sometimes dropping to 3.9% . This is at idle still in the stall. Has the dreaded K/N filter and intake tube. Checked MAS for c...
August 07, 2006
2000 Ford Taurus SE 4-Valve 3.0L Poor Idle Quality VIN: 1FAFP55S2Y
P0171: too lean bank 1. ... came in with the mil on.pulled codes p0171, p0174. fuel trim was way out of specs indicating a vacuum leak. replaced upper intake seals and the stft and ltft came back to o%. road tested car and on second trip the mil came back on ,171,174. i replaced the ...
August 08, 2006
2002 Chevrolet Cavalier 2.2L Poor Idle Quality, Surge, Stall, MIL Lamp on VIN: 1G1JC12482
P0171: Fuel System Lean (Bank 1). ... warmed up. the evap code is not affecting this issue. the p1171 is because it is running lean. the fuel pressure is normal according to spec. there is no engine running spec. that i can find. fuel pressure appears to be ok. the waveform is ok. replaced fue...
August 09, 2006
2000 Ford Windstar LX 3.8L Poor Idle Quality, Hesitation, Misfire, MIL Lamp on VIN: 2FMZA5149Y
P0171: bank 1 lean. ... after tsb repair. We keep having a p0171 & p0174 in this car. very sluggish on excel, knocking on excel after lower intake repair if richen up smooths out. the data of snap-on scanner, ps 6.8 ms idle, 16.0 snap throttle short trim idle 20 % long 19% @2...
August 09, 2006
1997 Honda Odyssey LX 2.2L MIL Lamp on
P0171: Fuel System Too Lean (Bank 1). I have this honda that will intermittly set lean codes. When driven with the scanner ST FT stay at about 2%, long term about 5%, but sometime on decel ST FT rise to 30%. Car has had major tune up including wires,cap,rotor,air and fuel filter and valve adjustme...
August 10, 2006
1999 Lexus RX300 3.0L Excessive Emissions, Misfire, Poor Fuel Economy, lacks power VIN: JT6HF10U3X
P0171: lean. This vehicle has negative fuel trims on bank 2 and positive trims on bank 1. I tried swapped af sensors from side to side and trims remained the same. I have replaced MAF and 1 igntion coil. This suv has no power sounds like pinging under load. I have checked ...
August 10, 2006
2000 Toyota 4Runner Limited 3.4L MIL Lamp on VIN: JT3HN86R84
P0171: Fuel System Too Lean (Bank 1). THIS VEHICLE HAS A LEAN CODE PO171, CHECK MAS AIR FLOW AND FUEL PRESSURE AND BOTH ARE WITHIN SPEC. REPLACE AF SENSOR, SPARK PLUGS, FUEL FILTER, AND PCM. NO CHANGE, LONG TERM FUEL TRIM IS AT 39.2 WHICH IS FAR HIGHER THAN LIMITS, AT 38.8% LOAD IN FREEZE FRAM. AL...
August 10, 2006
2002 Kia Sedona EX 3.5L MIL Lamp on VIN: KNDUP13102
P0171: Fuel System Too Lean (Bank 1). We have persistant lean codes we cleaned the MAF & smoke tested, could not find any vacuum leaks, we suspect a bad MAF, but can't confirm, and don't want to guess. Any of you Kia guys seen this? Thanks a million!
August 17, 2006
1999 Toyota Sienna LE 3.0L MIL Lamp on VIN: 5766548987
P0171: Fuel System Too Lean (Bank 1). Vehicle was service recently at a different shop (ignition wires,spark plugs, fuel filter you know, the basics) customer has always complaint of the check engine light "on" that is the reason he got the tune-up done (per own request!)any ways light is ...
August 17, 2006
2000 Mazda Protege DX 1.6L Loss of power VIN: JM1BJ222Y0
P0171: Adaptive Fuel Trim Too Lean (Bank 1). ... on. Code P0171. We found the air boot split in two places. Replaced air boot, but when we test drove car it still felt like it was running too lean, it hesitated on accellertion. We knew there was a updated air mass sensor, so we installed a factory air ma...
August 18, 2006
1999 Toyota Sienna LE 3.0L MIL Lamp on VIN: 5766548987
P0171: Fuel System Too Lean (Bank 1). Vehicle was service recently at a different shop (ignition wires,spark plugs, fuel filter you know, the basics) customer has always complaint of the check engine light "on" that is the reason he got the tune-up done (per own request!)any ways light is ...
August 21, 2006
2001 Ford Explorer Sport Trac 4.0L MIL Lamp on VIN: 1FMZU67E81
P0171: Lean Bank 1. ... shed me some light on this vehicle. Its a 2001 Ford Explorer Sport Trac with a 4.0. Vehicle run fine but is running lean at idle. What i found so far is there is 2 codes stored in memory P0171 & P0174 that was stored in memory. LTFT % is at idle is 25 ...
August 22, 2006
1996 Honda Accord EX 2.2L Hesitation VIN: 1HGCD5665T
P0171: Fuel System Too Lean (Bank 1). ... runs rough. Check engine light been on for 2yrs. original code rear o2 sensor dont remember the number of it. Vehicle in need of tune-up. Replace spark plugs, air filter, fuel filter and clean throttle body. Decided to clean egr passages cause figured they...
August 28, 2006
1998 Ford Escort ZX2 Hot Coupe 2.0L Poor Idle Quality, MIL Lamp on VIN: 3FAKP1135W
P0171: Bank 1 system lean. This vehicle idles poorly, it is worse when cold but does it all the time. The baro pid on ngs was 145 very low for my neck of the woods, I cleaned mass air flow now reads 160. Checked long and short fuel trims long at 10 to 12 and short is swiching but trends...
August 30, 2006
1997 Ford Contour GL 2.0L MIL Lamp on VIN: 1FALP6538V
P0171: lean bank 1 continous code. keeps setting a lean bank one code. we replaced injector harness, no injector faults in memory after this fix. we have installed coolant temp sensor, both oxygen sensors, pcv, ect sensor, water pump and t-stat. iat tests ok. plugs and wires new and test good. ...
August 31, 2006