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P0171 Diagnostic Trouble Code Discussion for April 2011

Fuel System Lean (Bank 1)

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Trouble Ticket Help Requests for DTC P0171
Help Request Posted
2003 Ford F-150 XLT 5.4L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1FTRX18L03
P0171: Lean bank 1. Need help on a f150. Codes are 171 and 175. Rich and lean on opposite banks. Replaced coils and plugs to no result. Replace both front o2 sensors. No result. Fuel trim is a minus 24% and a positive 22%. Compression test was between 165-175 all cylinders. Don't...
April 01, 2011
2007 Chevrolet Colorado LS 2.9L MIL Lamp on VIN: 1GCCS14907
P0171: Fuel System Lean. ... codes ( going from memory )...P0131,P0171,P0455 & P1133. Upstream O2 seems a little slow but is switching even during the Top Engine Cleaning process it was switching. I should have written down the freeze frame info before I left (worked till 9pm) but...
April 06, 2011
2000 Toyota Tacoma SR5 3.4L Excessive Emissions, Poor Idle Quality, Hesitation, Surge, MIL Lamp on VIN: 41AWN72N0Y
P0171: Fuel System Too Lean (Bank 1). customer concern was lack of power and hesitates,i could not road test it would barely run,it would back fire through the throttle body, checked cam and crank timing all marks are in time.checked for external vacuum leaks with propane no leaks found.truck ran ...
April 08, 2011
2001 Toyota Corolla CE 1.8L Poor Idle Quality, MIL Lamp on VIN: 2T1BR12E11
P0171: Fuel System Too Lean (Bank 1). Hi all, I have this 01 Corolla that is running lean at idle and a little rough. at 4000rpm fuel trim is less than 5%. at 2000 rpm its about 15%. fuel trim short and long add to 28%-33%at idle. tried cleaning the MAF and replacing with used one. same MAF readin...
April 09, 2011
2003 GMC Yukon Denali 6.0L MIL Lamp on VIN: 1GKFK66U73
P0171: Fuel Trim System Lean (Bank 1). after changing the MAF with 4 NEW ones the readings ( trim ) get worse , I put a "test" unit in and it goes to 12-16 % LT 0 % (+-) 4% ST . is there a new PCM calibration for the new MAF units ?? unfortunately my "test " unit fails when hot !
April 13, 2011
2005 Lincoln LS Luxury 3.0L Poor Idle Quality, Hesitation, Surge, Misfire, MIL Lamp on VIN: 1LNHM87A65
P0171: Lean bank 1. ... codes on the second trip every time. Some times it sets a p0300 when it idles rough but not always. On light acceleration it has terrible spark knock, but seems to clear up and run good if you give it a decent amount of p...
April 20, 2011
2000 Lincoln Continental 4.6L No Start VIN: 1LHNM97V7Y
P0171: Lean condition. Car was towed in as no start,has spark and injector signal all plugs keep getting gas soaked,scan data readings all show normal cts normal iat.lowered front exhaust ypipe no change,compression checks good 165psi.any ideas?
April 22, 2011
2001 Toyota Celica GTS 1.8L MIL Lamp on VIN: JTDDY32T51
P0171: Fuel System Too Lean (Bank 1). What are the readings supposed to show for the MAF sensor... gm/s for idle, acceleration and snap wot? According to All Data the front 02 sensor needs to alternate above .55v and then below .4v. The reading did not always go above and below those values, does...
April 29, 2011