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P0171 Diagnostic Trouble Code Discussion for March 2010

Fuel System Lean (Bank 1)


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Trouble Ticket Help Requests for DTC P0171
Help Request Posted
2001 Ford Focus LX 2.0L MIL Lamp on, HIgh Fuel Trim VIN: 1FAFP33P61
P0171: Lean on Bank 1. Originally when the car came in it was at like +32 on longterm and another +15 on short term. the first thing that I found was when blocking off the back vaccum port for the pcv that short term would go -19 so I knew I had a issue with the pcv system. The maf ...
March 01, 2010
2002 Toyota Corolla LE 1.8L Hesitation, MIL Lamp on VIN: 1NXBR12E02
P0171: Fuel System Too Lean (Bank 1). hi everybody,i have this 02 corolla withs the check engine light on ,when the light comes on vehicle looses power on acceleration,data from o2 sensors is normal,iac motor is working ok,will this be computer related problem,please any help wil be apreciated.
March 01, 2010
2007 Chevrolet Tahoe LT 5.3L MIL Lamp on
P0171: Fuel System Lean (Bank 1). ... and I'm home. Short history. I replaced all lifters about 2k miles previous due to a couple collapsed(active fuel mngt). Cust has returned w/ mil on and p0171, lean bank 1. Have verified and duplicated twice now. Bank 1 will run 24% LT after a 10 -30 mile ...
March 10, 2010
2005 Volkswagen Passat GL 1.8L Poor Idle Quality, Misfire, MIL Lamp on VIN: WVWAD63B55
P0171: bank 1 system lean. I have this Passat come in idling real bad and check engine light blinking. Pulled codes and initially found misfire codes on all cyl's and lean code bank 1. Customer previously had been at VW dealer and they diagnosed as 4 bad coils. They installed new coils ...
March 10, 2010
1999 Chevrolet K1500 Suburban 5.7L MIL Lamp on VIN: 3GNFK16R4X
P0171: Fuel Trim System Lean (Bank 1). There were no codes before we changed the intake gaskets. The long term fuel trim goes to 25% on both banks within 5 miles of driving. Plugs are clean and gas readings show the system is lean. We have done the usual, smoked the intake-no leaks, fuel 10% alcoho...
March 11, 2010
2007 Chevrolet Tahoe LT 5.3L MIL Lamp on
P0171: Fuel System Lean (Bank 1). ... and I'm home. Short history. I replaced all lifters about 2k miles previous due to a couple collapsed(active fuel mngt). Cust has returned w/ mil on and p0171, lean bank 1. Have verified and duplicated twice now. Bank 1 will run 24% LT after a 10 -30 mile ...
March 11, 2010
2006 Scion xB 1.5L Hesitation, Surge, Cuts out, Stall, MIL Lamp on VIN: JTLK732476
P0171: Fuel System Too Lean. Hello to all members.I would like to apologize for the lack of information on this but this vehicle belongs to the Yellow Cab Co. and it's spring break so we are swamped and they are also. So needless to say they have dumped this on us and want it back now. Th...
March 11, 2010
2003 Toyota Corolla CE 1.8L No Start, no injector pulse VIN: 1NXBR32E13
P0171: Fuel System Too Lean (Bank 1). thanks ahead of time guys. i had this corolla towed in off the road after stalling and not restarting. i did some basic checks and found it had spark and the fuel pump is running , but it has no injector pulse. i know some vehicles, i.e.general motors, will cu...
March 11, 2010
1999 Ford F-150 4.2L MIL Lamp on VIN: 1FTZX1720X
... for codes, p0171, p0172 both stored. checked for usual vacuum leaks at pcv hose and around intake gaskets. monitored both o2 sensors and maf meter. all appears to be within spec and working. truck is running ok and no other symptoms occour. Any help will s...
March 12, 2010
2004 Chrysler Town & Country (Van) Limited 3.8L Excessive Emissions, Poor Fuel Economy, MIL Lamp on VIN: 2C4GP54L24
P0171: system lean code. ... runs PIG RICH 10%+ CO. the code that sets is p0171 system lean??? HUH?? Ok It has been "like this" for a coulpa months! Been to at least 2 other shops!! The story gets longer and deeper the further I go! When I got it the Cat was plugged and wouldn...
March 16, 2010
2002 Ford Windstar 3.8L MIL Lamp on VIN: 2FMZA50422
P0171: testing and results. long term fuel trim climbs too 20 within 3 minutes
March 17, 2010
2006 Chevrolet Silverado 1500 LS 4.3L MIL Lamp on VIN: 1GCEC14X56
P0171: Fuel Trim System Lean (Bank 1). this car is giving me a fit. Found the cap and rotor button had not been changed. But the truck still wants to run funny. The MAF code stays with a new MAF installed. Bank 2 is where all of the misses are occuring. Please help
March 19, 2010
1999 Toyota Tacoma SR5 3.4L Excessive Emissions VIN: 4TAWN72N2X
P0171: Fuel System Too Lean (Bank 1). ... giving us a little trouble. Failed e-test, customer brought us the truck, checked for codes and got a p0171, checked air filter and MAF, customer usually cleans his own K+N air filter and overoiled it it looked like, filter was horribly clogged and MAF had...
March 19, 2010
2001 GMC Savana 2500 5.0L MIL Lamp on VIN: 1G1FG25M91
P0171: Fuel Trim System Lean (Bank 1). ... came in with a p0300, p0171, p0174. smoked upper intake for a vacuum leak, found and , replaced plenum gasket. Resmoked intake and no leaks are present, although there is small leak where air tube meets throttle body/ oring ...
March 22, 2010
1999 Lexus RX300 3.0L MIL Lamp on VIN: JT6GF10U4X
P0171: lean condition bank 1. this vehicle came to our shop with a check engine light on and a dead (not switching) air fuel sensor. we replaced both sensors due to age of vehicle and cleared codes. customer drove vehicle and light came back on. has code po171 again but the oxygen sensor i...
March 23, 2010
1999 Toyota Tacoma SR5 3.4L Excessive Emissions VIN: 4TAWN72N2X
P0171: Fuel System Too Lean (Bank 1). ... giving us a little trouble. Failed e-test, customer brought us the truck, checked for codes and got a p0171, checked air filter and MAF, customer usually cleans his own K+N air filter and overoiled it it looked like, filter was horribly clogged and MAF had...
March 23, 2010
2004 Mazda 6 S 3.0L MIL Lamp on VIN: 1YVFP82D1P
P0171: Adaptive Fuel Trim Too Lean (Bank 1). ... no problem solved car orignially came in and codes presensted p0171 and p0174 fuel trims were at max 20% long term both banks suspected mass air flow sensor cleaned and no change to fuel trims mass air sensor replaced with...
March 28, 2010
1998 Ford Windstar 3.8L Poor Idle Quality, Cuts out, Misfire, MIL Lamp on VIN: 2FMZA5146W
P0171: lean bank1. Hi I have this van here that I can't seem to get figured out. It has a miss mostly when it gets driven for awhile and then I get a lean bank 1 code. I replaced the spark plug and wire on #2 and it still will miss. Not all the time but mostly when comming to a ...
March 30, 2010
2002 Toyota Celica GT 1.8L Poor Idle Quality, Hesitation, Misfire
P0171: Fuel System Too Lean (Bank 1). customer disconnected battery to turn off the check engine light, then car no start and run rough with misfire code.bog down under snap throttle.but slowly cracked the throttle is ok or over 1500 rpm. vehicle running fine with light on. thinking vvit system. b...
March 30, 2010
2001 Jaguar XJ8 4.0L MIL Lamp on, Restricted Performnc VIN: SAJDA14C21
P0171: Bank1 Lean. Hello everyone. This car originally came in with lean codes and evap small and very small codes. I checked fuel pressure at the time, 30psi/idle and 40psi/wot. LTFT and STFT were all 20-22%. I replaced the fuel pump; now fuel pressure is 36psi/idle and 44psi/w...
March 31, 2010