Join Now
International Automotive Technicians Network

P0171 Diagnostic Trouble Code Discussion for February 2007

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
2001 Ford Windstar 3.8L MIL Lamp on
P0171: lean condition. vehicle is in lean condition fp is 31, ran diagnostics last night vehicle is returning today. does anyone have fuel pressure specs for this vehicle. going to clean maf and recheck for vac leaks, change fuel filter.also under mode 6 tids 26,2a,2b cid 00 failed....
February 01, 2007
1999 Mazda Protege DX 1.6L MIL Lamp on VIN: JM1BJ22Z1X
P0171: Adaptive Fuel Trim Too Lean (Bank 1). thanks in advance for your input on this. I have this protege that came in last week with a po171 stored (sys to lean). LT fuel trim is 15 constantly on and off idle. Fuel pressure was good i smoked the intake to check for leaks and found none. I scoped the fr...
February 02, 2007
1999 Mercury Sable GS 3.0L Stall VIN: 1MEFM5557Y
P0171: bank one system lean. Car has a intermitant stall at a stop with a extended restart time of about five to ten seconds. Car runs smooth with no flat spots and plenty of power. All the oxygen sensors are running .20-.30 millivolts at idle and at 2500 rpm,way low. Put carb. clean into...
February 02, 2007
2000 Lexus ES300 3.0L Hesitation VIN: SGUGOGJOOU
P0171: Fuel System Too Lean (Bank 1). car has a flat spot when you accelerate.It dies on load not all the way but halfway.
February 03, 2007
1996 Ford F-150 Eddie Bauer 4.9L monitor won't reset VIN: 1FTEF15Y9T
P0171: lean bank 1. Vehicle came in because it had failed emissions. Fuel pressure was low, so the fuel pump was replaced. This took care of the PO171 & PO174. The PO385 did not reset after codes were cleared. In Arizona, the emissions department will allow vehicles to be lic...
February 07, 2007
1999 Ford Explorer XL 4.0L Misfire, MIL Lamp on VIN: 1FMZU34X0X
P0171: sys. lean B1. Hello folks I have question. This exploder came to me today with a misfire on the #3 cylinder. I checked it out and found the ceramac around the elctrode of the spark plug was cracked in two places. I replaced the plug and engine runs good. MAF volts good, Fue...
February 07, 2007
2001 Chevrolet Cab & Chassis Silverado 3500 6.0L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1GBJC34U21
... are over 20%.Scanned PCM with Genesys and retrieved P0171,P0174,P0300, & P0332. Road tested vehicle, engine bucked severely under load. Replaced extre...
February 08, 2007
1999 Mazda Protege DX 1.6L MIL Lamp on VIN: JM1BJ22Z1X
P0171: Adaptive Fuel Trim Too Lean (Bank 1). thanks in advance for your input on this. I have this protege that came in last week with a po171 stored (sys to lean). LT fuel trim is 15 constantly on and off idle. Fuel pressure was good i smoked the intake to check for leaks and found none. I scoped the fr...
February 09, 2007
2000 Mercury Mystique GS 2.5L Surge, Stall, MIL Lamp on VIN: 1FAFP66L6Y
P0171: lean bank 1. can't here any vacuum leaks customer stated that this problem happened all of a sudden any help would be greatly appreciated also had a cougar that has same problem thanks mark
February 09, 2007
2000 Ford Windstar LX 3.8L MIL Lamp on VIN: 2FMZ5142YB
P0171: lean exh. The only thing unusual is the code set upon start up. I can drive for a while and park with ses light off. upon start up the ses self test and then stay on and code appears. I seem to be missing something, I have looked at this vehicle off and on for a year an...
February 12, 2007
2004 Ford F-150 FX4 5.4L MIL Lamp on VIN: 1FTPX14564
P0171: Bank 1 Lean. ... shop with lean codes on both banks. P0171, and P0174. Freeze frame was set at 1200 rpm, 0 mph, 183'F ECT, and 22'F IAT, 54% load. The problem we are having, (is not only that we cannot duplicate it at that rpm), but when driving the truck, LTFT hangs aro...
February 14, 2007
2001 Volkswagen Passat GLS 1.8L Excessive Emissions, Poor Idle Quality, Hesitation, Surge VIN: WVWAC63B41
P0171: Sytem Lean. Came in with bogs & jerks on acceleration, ck engine lite on. Had no power to even move. Replaced MAF got power now but cruise it surges with steady pedal. Touched batt. cables together. ran ok then until drove it a while and it surges again. with emmissio...
February 19, 2007
2000 Nissan Maxima GLE 3.0L Poor Idle Quality, Hesitation, Surge, Cuts out, Stall, MIL Lamp on VIN: JN1CA31A8Y
P0171: Fuel Trim Lean (Bank 1). This car has bocome a thorn in my side. It came into the shop with poor idle, hardly running and stalling. The check engine light was on with the lean codes. The fuel pressure was good and the car was running perfect so we let it sit for a couple of days. When...
February 23, 2007
1999 Ford Explorer Eddie Bauer 4.0L Surge, Stall VIN: 1FMZU34E0X
... P0171 and P0174 stored lean fuel trims bank one and two. Long term fuel trims were way positive. If the throttle was cracked off idle the fuel trims would go directly to zero or a little negative. If the throttle was heal...
February 26, 2007
1999 Ford Explorer Eddie Bauer 4.0L Surge, Stall VIN: 1FMZU34E0X
... P0171 and P0174 stored lean fuel trims bank one and two. Long term fuel trims were way positive. If the throttle was cracked off idle the fuel trims would go directly to zero or a little negative. If the throttle was heal...
February 27, 2007
2001 Ford Explorer Sport 4.0L Poor Idle Quality, Stall, MIL Lamp on VIN: 1FMYU70E51
P0171: System too lean bank 1. ... Ford that we cannot seem to fix. We followed the post trail on here to fix it and none of the fixes have worked. Here are the symptoms. On a cold day during first start up the truck will idle erratically and stall. On second start up it will run better but...
February 27, 2007
2001 Kia Optima SE 2.4L Poor Idle Quality, MIL Lamp on VIN: KNAGD12641
P0171: Fuel System Too Lean (Bank 1). Having trouble with this kia has code po171 lean bank 1. Fuel trims are maxed @ 16.4% short term & 19.5% long term O2 is stuck @ 20mv can make O2 hit 900mv by applying full throttle also can make calculated load hit about 90% by applying full throttle.I ha...
February 27, 2007
2001 Ford Explorer Sport 4.0L Poor Idle Quality, Stall, MIL Lamp on VIN: 1FMYU70E51
P0171: System too lean bank 1. ... Ford that we cannot seem to fix. We followed the post trail on here to fix it and none of the fixes have worked. Here are the symptoms. On a cold day during first start up the truck will idle erratically and stall. On second start up it will run better but...
February 28, 2007
2001 Nissan Pathfinder SE 3.5L MIL Lamp on VIN: JF8DP07X51
P0171: Fuel Trim Lean (Bank 1). ... problem and code p0171 p0172 we replaced the cooling sensor car drove 490 mil. and the chk engine light came back on w/code p0171 p0174 p0140 LTF at 0% and SFT at -10% and -14% the cust. complained that the truck has a hesitation at 2500 to 3500 RPM i do n...
February 28, 2007