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P0171 Diagnostic Trouble Code Discussion for November 2005

Fuel System Lean (Bank 1)


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Trouble Ticket Help Requests for DTC P0171
Help Request Posted
1998 Ford Expedition Eddie Bauer 5.4L MIL Lamp on VIN: 1FMFU18L6W
P0171: o2 bank 1 lean. hi, got a 1998 ford expedition which came in with a po 171 code first, replaced r/side o2. 1 week later got both codes saying both banks lean. did a fuel pressure test and readings are fine at 34 psi with a 2 psi drop after 5 minutes. replaced the filter. rem...
November 01, 2005
1999 Ford Windstar SEL 3.8L MIL Lamp on VIN: 2FMDA5346X
P0171: lean exhaust bank 1. hi everyone i need some help here vehicle came to me with no drivability concerns other than mil illumination.scanned vehicle and found these two codes all pids look normal to me except ofcourse ltft on both banks.i read on alldata about vacuum lines being con...
November 01, 2005
2001 Ford Windstar SEL 3.8L Poor Idle Quality, Misfire, MIL Lamp on VIN: 2FMDA56481
P0171: system lean bank 1. I have this 01 Windstar with MIL on and consistent code PO305. This van runs excellent at anything above an idle. At idle, it will have a slight miss, worse when in park. I think I have a lean misfire, but what concerns me is that the lean bank and the missing...
November 01, 2005
1999 Ford Expedition Eddie Bauer 5.4L MIL Lamp on VIN: 1FMRU17L1X
P0171: bank 1 lean. LTFT on both banks remain at 25% all the time. STFT at 3%-6% This occurs at idle or cruise. All other data appears normal. No vacuum leaks found. O2 sensors appear to be operating normal.
November 07, 2005
1998 Volvo S70 2.4L Misfire VIN: YV1LS5574W
P0171: long term fuel trim/idle lower limit ///fet 232. we had reset the engine light last week after minor tune up. car came back in next day with engine light on again. many codes present but no drivabilty complaints. customer says idles a bit rough somtimes. we are wondering if the maf sensor could be our proble...
November 08, 2005
1999 Ford F-150 4.2L No Start VIN: 1FTZ1726XK
P0171: system lean bank 1. Hello everyone I have this ford pickup that would not start this morning, When it did not start the theft light was flashing real fast when I was cranking it over and would not start. The next time i tried to start it the the theft light stayed on normal and i...
November 11, 2005
1998 Ford Ranger XL 4.0L Surge
P0171: system lean bank 1. recieved after other mechanics attempted repair, maf contaminated with silicone,airbox broken,(replaced),5v signal from control unit to maf not indicated ,dvom,vga scope , and modis,measurement taken at ecm,and sensor(no code). tps, ect,iat,egr,dpfe,02,left&am...
November 12, 2005
1998 Chevrolet Blazer 4.3L Hesitation, Misfire, Poor Fuel Economy, MIL Lamp on VIN: 1GNT13W4W2
P0171: Fuel System Lean (Bank 1). Truck came in codes PO171, PO131,PO300, PO1870, and running rough. Found bank 1 sensor 1 dead and all plugs on that bank black. Replaced HO2S and did a major tune-up truck ran great. Came back 1 week later HO2 sensor dead again and plugs fouled. Replaced HO2S ...
November 14, 2005
2000 Ford Windstar LX 3.8L MIL Lamp on VIN: 2FMDA5143Y
P0171: system too lean bank 1. Dealing with an intermittent mil light, followed an all data tsb which asks to have the pcm reprogramed with latest calibration = done, inspect the vacuum line from the intake to the fuel psi regulator = ok, inspect LH valve cover for updated cover = ok, last ...
November 14, 2005
1998 Chevrolet Blazer 4.3L Hesitation, Misfire, Poor Fuel Economy, MIL Lamp on VIN: 1GNT13W4W2
P0171: Fuel System Lean (Bank 1). Truck came in codes PO171, PO131,PO300, PO1870, and running rough. Found bank 1 sensor 1 dead and all plugs on that bank black. Replaced HO2S and did a major tune-up truck ran great. Came back 1 week later HO2 sensor dead again and plugs fouled. Replaced HO2S ...
November 15, 2005
2003 Chevrolet Suburban 1500 LT 5.3L MIL Lamp on VIN: 1GNFK16Z63
P0171: Fuel Trim System Lean (Bank 1). vehicle is flex fuel. the only fuel pressure spec that i can find is for koeo. 55-60psi.fuel pressure when running is 44psi at rail. if pressure is taken at outlet of filter before alchol sensor pressure is 54psi. inlet and outlet of alchol sensor are differen...
November 16, 2005
2002 GMC Envoy SLE 4.2L No Start, Stall VIN: 1GKDT13S12
P0171: Fuel System Lean (Bank 1). vehicle was hauled in for no start. customer stated that the check engine light was on for 1 day, the next day it would'nt start. vehicle will run with motor vac supply line hooked to fuel rail at 52 psi. replaced fuel pump, vehicle will start and run for 5 se...
November 22, 2005
2000 Ford Windstar LX 3.8L Check engine light VIN: 2FMZA5141Y
... light comes on. Sometimes there is only one code, but sometimes there is two. The P0171, and P0174 codes are both related to lean fuel condition. I have checked and clean the EGR passages, replaced the intake gasket, installed OEM-PCV valve, cleaned the ma...
November 23, 2005
2000 Toyota 4Runner Limited 3.4L Hesitation, MIL Lamp on VIN: JT3HN87R9Y
P0171: Fuel System Too Lean (Bank 1). ... for us. Customer complains that it takes more than five seconds of cranking on occasion to start and then runs rough at initial start-up for the first minute or so. Left vehicle overnight for us to try.The truck cranked 4-5 seconds then fired up. No rough ...
November 23, 2005
1999 Ford Explorer Eddie Bauer 4.0L Poor Fuel Economy, MIL Lamp on VIN: 1FMZU34EZX
P0171: bank 1 lean. have had this thing in 3xs,same complaint cel,poor fuel milage and idle surches cold(idles from 1500 down to 500 rpms when first started in the am (outside temp 30ish degrees).after 45 to 60 seconds idles @ 12OOISH.HAVE CHECKED FOR VACCUM LEAKS @EVERY VISIT NO...
November 26, 2005
1999 Ford Windstar SEL 3.8L MIL Lamp on VIN: 2FMDA5341X
P0171: bank 1 lean condition. This car was directed to me by Down The Street Motors. The car was in for it's state inspection and failed for the codes listed above. PO171 and PO174. Both banks 1 and 2 are at the lean limit. I hear a vacuume leak coming from the intake maniflod gasket but I...
November 28, 2005
1999 Ford Explorer Eddie Bauer 4.0L Poor Fuel Economy, MIL Lamp on VIN: 1FMZU34EZX
P0171: bank 1 lean. have had this thing in 3xs,same complaint cel,poor fuel milage and idle surches cold(idles from 1500 down to 500 rpms when first started in the am (outside temp 30ish degrees).after 45 to 60 seconds idles @ 12OOISH.HAVE CHECKED FOR VACCUM LEAKS @EVERY VISIT NO...
November 29, 2005
2001 Ford Escort SE 2.0L MIL Lamp on VIN: 3FAFP13P21
P0171: fuel system lean bank 1. ... Found a P0171. Checked fuel trim readings, long term ft showed 25%. Checked for vacuum leaks. Could not find any. Found a couple of TSB's for leak detection/ lean fuel trim diagnostic tips. They are 01-20-5, and 04-17-4. We do not have a smoke machine avai...
November 29, 2005
2002 Ford E-150 Econoline 4.2L MIL Lamp on VIN: 1FTRE14212
P0171: System Too Lean Bank 1. Hello All I have ran into two of these vans in the last two days with high mileage and same codes. Both vans have NO drivibility problems associated with these codes other than a check engine light on. Both vehicles have had new MAFs, both front O2 sensors, an...
November 30, 2005