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P0171 Diagnostic Trouble Code Discussion for January 2011

Fuel System Lean (Bank 1) *

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Trouble Ticket Help Requests for DTC P0171

	Help Request	Posted
	2000 Chevrolet K3500 7.4L MIL Lamp on VIN: 1GCHK33J5Y P0171: Fuel Trim System Lean (Bank 1). ... details as customer was in a hurry!when i told him the code and that i would like to test the o2 sensors he insisted i just replace them.i did.i ran a mode 6 scan and it showed that the egr had failed the cruise test and decel test.i cleared code p0171 sys...	January 04, 2011
	2004 Ford F-150 FX4 5.4L No Start, Poor Idle Quality, MIL Lamp on VIN: 1FTPX14594 P0171: Lean bank 1. ... crank time. Got it to act up and watched fuel pressure drop until it died. Had stored code p1233 in it at this time. Checked power and ground at pump and it was ok but pump wouldnt run. Hit pump and it ran. Put pump in and it wouldn't run. No pump noise. C...	January 04, 2011
	2003 Ford E-250 5.4L MIL Lamp on VIN: 1FTNE24L63 P0171: Lean bank 1. ... drove off lot and check engine light came on very quick. P0171 and p0174 both sides plus 50% under all conditions, idle going down road, going up hill, going down hill.we smoked intake egr was pouring replaced numbers wen...	January 05, 2011
	2004 Ford F-150 FX4 5.4L No Start, Poor Idle Quality, MIL Lamp on VIN: 1FTPX14594 P0171: Lean bank 1. ... crank time. Got it to act up and watched fuel pressure drop until it died. Had stored code p1233 in it at this time. Checked power and ground at pump and it was ok but pump wouldnt run. Hit pump and it ran. Put pump in and it wouldn't run. No pump noise. C...	January 05, 2011
	1999 Jaguar XJ8 4.0L MIL Lamp on VIN: SAJKD6043X P0171: A bank combustion too lean. ... lit again, and when I scanned it I got the P0171/P0174 codes back along with the other two listed below. I am wondering if the method I used to get air into the still flooded motor after the repa...	January 06, 2011
	2000 Toyota Corolla LE 1.8L MIL Lamp on VIN: 2T1BR18EXY P0171: Fuel System Too Lean (Bank 1). ... cam in with a lean code P0171. Tested for vac leaks/smoked tested - none found. Tested fuel pressure - good. Replace both o2 sensors, and installed a new MAF from Toyota. Trims looked good. I road tested the car some more then the light came back on with t...	January 07, 2011
	2000 Chevrolet K3500 7.4L MIL Lamp on VIN: 1GCHK33J5Y P0171: Fuel Trim System Lean (Bank 1). ... details as customer was in a hurry!when i told him the code and that i would like to test the o2 sensors he insisted i just replace them.i did.i ran a mode 6 scan and it showed that the egr had failed the cruise test and decel test.i cleared code p0171 sys...	January 10, 2011
	2005 Ford Escape XLT 3.0L MIL Lamp on VIN: 1FMCU491X5 P0171: Fuel System Too Lean (Bank 1). ... p0174, cust requested to turn light off. Came back in few days later with the same two codes and a P0106 as well. Checked for vaccuum leaks with 2+2, could not find anything. Freeze frame data on codes are as follows : ECT- 142 farenheit LT Fuel Trim 1- 2...	January 10, 2011
	2001 Saturn LW300 3.0L No Start, Poor Idle Quality, Stall, Misfire VIN: 1G8JW82R71 P0171: Fuel Trim System Lean (Bank 1). vehicle came in running poorly went out to get car in am would not start at all unless holding throttle to floor after starting stalls with in 10 seconds and will not restart without holding to floor disconnected 1 3 5 coil no change runs exactly the same fuel...	January 10, 2011
	2007 Ford Focus SES 2.0L Poor Idle Quality, MIL Lamp on VIN: 1FAFP34N07 P0171: System too lean bank 1. ... mil light on (p0171 system too lean bank 1). Will not pass state inspection due to this. Engine also idles a little rough. Initially smoke tested and found leak from the area of the intake manifold runner control actuator (the vacuum diaphram looking deal)...	January 11, 2011
	1999 Chevrolet Silverado 1500 LS 5.3L No Start, Poor Idle Quality VIN: 2GCEK19TXX P0171: Fuel Trim System Lean (Bank 1). When truck sits outside overnight the next morning you go to start it and it fouls out the sparks and won't start,Then after cleaning plugs it runs fine. If you let it sit again it will do the same thing. Injector pulse is in spec. mass air sensor in spec. co...	January 13, 2011
	1999 Ford Windstar LX 3.8L Excessive Emissions, Poor Idle Quality, Stall, MIL Lamp on VIN: 2FMZA5145X P0171: lean b1. This van needs the intake gaskets and pcm reflash for lean, it also needs lower intake as seals at irc are leaking. The confusing part is engine will run fair go into closed loop and ltf wiil be37 stf will be 20, when all of a sudden ltf goes to 0 across the b...	January 17, 2011
	2007 Ford Focus SES 2.0L Poor Idle Quality, MIL Lamp on VIN: 1FAFP34N07 P0171: System too lean bank 1. ... mil light on (p0171 system too lean bank 1). Will not pass state inspection due to this. Engine also idles a little rough. Initially smoke tested and found leak from the area of the intake manifold runner control actuator (the vacuum diaphram looking deal)...	January 17, 2011
	1999 Mercury Cougar V6 2.5L MIL Lamp on P0171: Bank 1 system lean. ... on. P0420 cat efficiency B1, P0401 EGR low flow (maybe it was a different code)None the less, customer declined repairs. She came in yesterday wanting her MIL off cause it is emissions time. I pulled codes P0171, p0174 Le...	January 19, 2011
	1999 Ford F-350 Super Duty Lariat 6.8L Hesitation, Cuts out, Stall, Misfire, MIL Lamp on P0171: Exhaust Lean Bank 1. This truck is making me crazy. Customer reported truck cuts out under load. He replaced the fuel filter and fuel pump. He said it ran great for about 1 week then started doing the same thing again. They replaced the fuel filter again thinking it might be dirty...	January 20, 2011
	2003 Toyota Tacoma Pre Runner 3.4L MIL Lamp on VIN: 5ETGN92N53 P0171: Fuel System Too Lean (Bank 1). ... the P0171 other than replacing the MAF or air/fuel ratio sensor which we have done to the vehicle?	January 20, 2011
	2002 GMC Sonoma SL 4.3L MIL Lamp on VIN: 1GTCS19W02 P0171: Fuel System Lean. Trying to get information, about what running fuel pressure should be and if there has been many common complaints in this area	January 26, 2011
	2003 Chevrolet Silverado 1500 LS 5.3L MIL Lamp on VIN: 2GCEK19T13 P0171: Fuel Trim System Lean (Bank 1). codes p0171 & p0174 always come back after drive cycle is complete. truck never has a missfire, poor performance, or bad idle. looked for tsb on this problem & did not find any. we suspect intake leak or poor injector performance but can not nail it do...	January 27, 2011
	2000 Toyota Tacoma Limited 3.4L MIL Lamp on, p0171 VIN: 4TAWN72N4Y P0171: Fuel System Too Lean (Bank 1). This is the bosses truck and I am scratching my head about this one. any toyota techs out there ever run into this problem. thanks in advance.	January 27, 2011
	2003 Jaguar X-Type 2.5L Poor Fuel Economy VIN: SAJEA51D73 P0171: system leanbank 1. ... owned this car for 4 years and drives mostly highway.He states that fuel mileage went from 30 mpg to 24,suddenly. Car drives fine.Checked for engine codes,originally had p0171 and p0174,system lean bank 1 and 2 and P0420,cataly...	January 28, 2011
	2001 BMW 740iL 4.4L MIL Lamp on VIN: WBAGH83471 P0171: Lean bank 1. ... originally came in with a misfire and other maintenance issues. After replacing spark plugs and fuel filter, misfire went away. Car came back months later with the p0171 and p0174. lean on both banks. Performed Fuel system clea...	January 31, 2011
	2002 GMC Sonoma SL 4.3L MIL Lamp on VIN: 1GTCS19W02 P0171: Fuel System Lean. Trying to get information, about what running fuel pressure should be and if there has been many common complaints in this area	January 31, 2011
	1999 Volvo S80 T6 2.8L Excessive Emissions, Poor Idle Quality, MIL Lamp on VIN: YV1TS90D8X P0171: long term fuel trim upper limit. ... a couple months ago for a check engine light on. Had a code for bank 2 rear o2s heater and some fuel trim code. owner stated that the car had been sitting for about a year prior. we changed the 02s and cleared the light. the fuel trim numbers looked ok so ...	January 31, 2011