Join Now
International Automotive Technicians Network

P0171 Diagnostic Trouble Code Discussion for December 2008

Fuel System Lean (Bank 1)


Note: This is a professional automotive technician's resource.
Vehicle Owners: If you are seeking an automotive repair professional to service your vehicle, visit the iATN Repair Shop Finder.

Trouble Ticket Help Requests for DTC P0171
Help Request Posted
2002 Ford E-350 Econoline 5.4L Misfire, MIL Lamp on VIN: 1FTSS34L22
P0171: lean bank one. ... p0305,p0306,p0308 miss fire codes, p0316 lean missfire on startup. this van really runs half way decent, has slight engine missfire on acceleration. cold start and cold running are great other than t...
December 01, 2008
2005 Honda Accord LX 2.4L MIL Lamp on VIN: 1HGCM56435
P0171: Fuel System Too Lean (Bank 1). ... This accord runs fine but pops this lean code. Found p0171, so I reset it and road tested STFT is +20% to +15% and its driving the LTFT lean also. When it came in the LTFT was about +20%. I looked at the MAF and it looks clean as a whistle, smoked the inta...
December 01, 2008
1995 Mercury Grand Marquis GS 4.6L MIL Lamp on VIN: 2MELM75W2X
P0171: Left bank lean exhaust. This car runs fine no driveability symptoms only CE light comes on. This car has all the signs of a classic vacuum leak at idle I have smoke tested the intake system only has a small amount of smoke coming from the vent on the IAC. I plugged off the vent it d...
December 03, 2008
2000 Chevrolet Prizm 1.8L MIL Lamp on, P171 VIN: 1Y1SK528SY
P0171: lean on bank 1. the car came in with p171 in memory codes. i took out the maf sensor and it was bad dirty cleaned it and car was fine for about 100 miles then light came back on and the lt fuel trim was at 32%. so i smoked the intake and found nothing i smoked the exhaust and...
December 04, 2008
2005 Honda Accord LX 2.4L MIL Lamp on VIN: 1HGCM56435
P0171: Fuel System Too Lean (Bank 1). ... This accord runs fine but pops this lean code. Found p0171, so I reset it and road tested STFT is +20% to +15% and its driving the LTFT lean also. When it came in the LTFT was about +20%. I looked at the MAF and it looks clean as a whistle, smoked the inta...
December 05, 2008
2003 Mazda MPV LS 3.0L MIL Lamp on VIN: JM3LW28A53
P0171: Adaptive Fuel Trim Too Lean (Bank 1). ... of the codes:P0171 and P0174. After running 30 kms, same MILs came on again. Engine running is very smooth and sound level is normal. I inspected the vacuum hoses and exhaust side crack visually, and I could not find any ...
December 05, 2008
2001 Mercury Cougar 2.5L No Start VIN: 1ZWFT61LO1
car is a no start. Has no spark. Crank position sensor is functioning correctly. Has fuel pressure all the time. Coil has been replaced. All power and grounds are available at the ecm. Power is available at the coil pack while cranking. One question I have is ...
December 05, 2008
2003 Chevrolet Suburban 1500 LS 5.3L Poor Idle Quality, Stall, Poor Fuel Economy, MIL Lamp on VIN: 3GNSK16Z73
P0171: Fuel Trim System Lean (Bank 1). ... belongs to my nephew, came in with the MIL on with a code P0101 MAF open circuit,and a very erotic idle so I replaced the MAF and cleared the code, test drove and the MIL returned, this time it had P0171 and P0101 MAF and...
December 07, 2008
2004 Jeep Wrangler Rubicon 4.0L MIL Lamp on VIN: 1J4FA69S64
P0171: Fuel System Lean (Bank 1). ... came in with codes P0171 & P0174 Lean on both front & rear Banks. Found fuel pressure to be low. So we replaced fuel pump now we have 57PSI & reset all adaptives & did a drive cycle. While on drive cycle found LT front @ +16% And LT rear @ ...
December 08, 2008
2001 Cadillac Catera 3.0L Poor Idle Quality VIN: W06VR54R41
P0171: Fuel Trim System Lean (Bank 1). Hello to all, Need some help on this Catera. Vehicle came in po171 po174 po302 po303 po305. and a high idle problem vehicle had high idle prior to misfire replaced plugs and coil packs misfire gone still idles around 1100-1200 checked fuel pressure @ 30 PSI KO...
December 09, 2008
2002 Chevrolet Tahoe LS 5.3L MIL Lamp on VIN: 1GNEK13Z32
P0171: Fuel Trim System Lean (Bank 1). this truck came in with miss fire codes, we did a tune up first(Could actually see the spark plug wires arching), customer came back a week later with a new missfire, tested convertor for excessive back pressure - OK . tested fuel pressure OK. Located #3 injec...
December 09, 2008
2002 Chevrolet Trailblazer LS 4.2L MIL Lamp on VIN: 1GNDT13S82
P0171: Fuel System Lean (Bank 1). ... passing emmision test,I scanned it and it showed thre [...],P0172 and P0340,I did order the cam sensor and did not install it yet,but I'm testing the fuel trims and can not figure out why it is lean and rich at the same time,checked fuel pressure,smoke tes...
December 09, 2008
2009 Toyota Sienna CE 3.5L MIL Lamp on VIN: 5TDZK29C38
P0171: bank 1 lean. ... after being repaired for an accident (front bumber up to front exhaust mani) check engine light is on p0171 and p0174. we put a scan tool on this car and got (the first number is at idle the second is at 2500rpm) LTFT1 ...
December 09, 2008
2001 Cadillac Catera 3.0L Poor Idle Quality VIN: W06VR54R41
P0171: Fuel Trim System Lean (Bank 1). Hello to all, Need some help on this Catera. Vehicle came in po171 po174 po302 po303 po305. and a high idle problem vehicle had high idle prior to misfire replaced plugs and coil packs misfire gone still idles around 1100-1200 checked fuel pressure @ 30 PSI KO...
December 10, 2008
2003 Ford F-150 XLT 4.6L Poor Idle Quality, MIL Lamp on VIN: 1FTRW07643
P0171: System lean b-1. ... idle,ck engine light on.Checked codes,p-0171,p0175,p0356,replaced #6 coil and plug,cleared codes,roadtested.p-0356 did not return, but lean and rich code did.Smoked motor,replaced leaking EGR,smoked EVAP system,passed tes...
December 10, 2008
2004 Jeep Wrangler Rubicon 4.0L MIL Lamp on VIN: 1J4FA69S64
P0171: Fuel System Lean (Bank 1). ... came in with codes P0171 & P0174 Lean on both front & rear Banks. Found fuel pressure to be low. So we replaced fuel pump now we have 57PSI & reset all adaptives & did a drive cycle. While on drive cycle found LT front @ +16% And LT rear @ ...
December 10, 2008
2009 Toyota Sienna CE 3.5L MIL Lamp on VIN: 5TDZK29C38
P0171: bank 1 lean. ... after being repaired for an accident (front bumber up to front exhaust mani) check engine light is on p0171 and p0174. we put a scan tool on this car and got (the first number is at idle the second is at 2500rpm) LTFT1 ...
December 11, 2008
2004 Lincoln Navigator 5.4L Poor Idle Quality, MIL Lamp on VIN: 5LMFU28R14
P0171: bank one systen lean. ... scanned for codes and had p0171, and p0172 for both banks being lean. left side head was removed and # 7 hole had exhaust valve burnt thru. Now the vehicle has a rough idle and no misfire but p0171 code comes up right away. The other code is nowhere to be ...
December 15, 2008
1999 Jeep Grand Cherokee Laredo 4.0L Hesitation, Surge, Cuts out, Stall, Poor Fuel Economy, MIL Lamp on VIN: 1J4GW58S1X
P0171: Fuel System Lean (Bank 1). ... every once and a while at stop light this jeep will start running rough and die, always starts back up right away, Check engine light comes on with code p0171 lean bank 1 I have looked this thing over for vacum leaks can't fined any did complete tune-up an...
December 16, 2008
2002 Saturn Vue 3.0L Hesitation, Surge, Stall, Misfire, MIL Lamp on VIN: 5GZCZ63B02
P0171: Fuel Trim System Lean (Bank 1). still barely runs at idle, play with gas pedal and it takes off after back firing a few times. then it dies. then you have to do it all over again. when it revs up its like a runaway. you have very little control over rpm.
December 16, 2008
1998 Ford Explorer Eddie Bauer 4.0L Excessive Emissions, Poor Idle Quality, Misfire, Poor Fuel Economy, MIL Lamp on VIN: 1FMZU32E1W
P0171: engine lean bank 1. This explorer has a bad missfire on cold start and with long term fuel trims at 25 on both banks I am changing the intake gaskets (seals). What I'm not sure of is I found a plastic vaccume line that has melted against the exhaust and can NOT find the source. I...
December 19, 2008
2001 GMC Yukon XL 1500 SLT 5.3L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1GKFK16T71
P0171: Fuel Trim System Lean (Bank 1). Hopefully one of you fine folks can shed some light on this Subdivision thats handing me my a@@! I put the fuel pump in back in April when it came in as a no start. At that time we also cleaned the MAF, T.B. and put plugs in it since they were fairly worn. Two...
December 19, 2008
1998 Ford Explorer Eddie Bauer 4.0L Excessive Emissions, Poor Idle Quality, Misfire, Poor Fuel Economy, MIL Lamp on VIN: 1FMZU32E1W
P0171: engine lean bank 1. This explorer has a bad missfire on cold start and with long term fuel trims at 25 on both banks I am changing the intake gaskets (seals). What I'm not sure of is I found a plastic vaccume line that has melted against the exhaust and can NOT find the source. I...
December 22, 2008
2003 GMC Yukon SLE 4.8L MIL Lamp on VIN: 1GKEK13V33
P0171: Fuel Trim System Lean (Bank 1). vehicle came in with hard system lean bank 1 and 2 codes, checked fuel pressure was 40psi, tried to adjust regulator would not change, replaced regulator and adjusted to 48 psi max, replaced fuel pump + filter and adjusted fuel pressure to 54psi. long term fue...
December 23, 2008
2001 Volkswagen Beetle GLX 1.8L Poor Idle Quality, Misfire, MIL Lamp on VIN: 3VWDD21C71
... confirmation from some of the Euro-car guys. This Beetle came in with a customer complaint of rough idle. Had a pending p0171 code which became a hard code on the test drive. Found that big y-shaped vacuum tube on the back of th...
December 24, 2008
1997 Volkswagen Jetta GLS 2.0L No Start VIN: 3VWSB81H7V
P0171: Lean Bank 1. First off, thank you in advace for any help. I have a 1997 Jetta towed in no start. The car hesitated and cut off on customer and now will not start. Has spark, injector pulse, fuel pressure 40psi, crank/no start. It will start with starting fluid and run fine...
December 27, 2008
1999 Ford Windstar LX 3.8L Poor Idle Quality, Surge, Cuts out, Stall, MIL Lamp on
P0171: bank 1 system lean. ... with this lean problem.But first let me apologize for not having the VIN#.IT was a crazy day and really forgot to jot down the VIN before vehicle was picked up.Will be back on Friday. Vehicle has this poor idle when in park and most noticeable in gear.It ...
December 30, 2008