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P0171 Diagnostic Trouble Code Discussion for July 2010

Fuel System Lean (Bank 1)


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Trouble Ticket Help Requests for DTC P0171
Help Request Posted
2007 Chevrolet Colorado LS 3.7L MIL Lamp on VIN: 1GCCS14917
P0171: Fuel System Lean. ... with no driveability complaint. Each time we pull two codes: P0326 Knock Sensor Perf and P0171 Lean O2 Sensor and read 3 freeze frames. Two of the freeze frames are for Code P0171 and were recorded at 34 miles and 1043 miles...
July 01, 2010
2000 Ford Focus LX 2.0L Excessive Emissions, MIL Lamp on VIN: 1FAFP33P1Y
P0171: system lean detected. ... to mention this car is the biggest mistake ford ever made. I have a p0171 that i cannot crack. I have smoked it and even threw a MAF sensor at it and a rear 02 sensor and still no dice. also when you are driving and you turn the ac on it feels like it has ...
July 02, 2010
2000 Jaguar XKR 4.0L MIL Lamp on VIN: SAJJA41B8Y
P0171: A bank combustion to lean. Car was at another shop and They replaced MAF, O2's Fuel Pressure regulator and code keeps coming back. Found hose pulled off of MAP sensor. Replaced and cleared codes Mil light not back on But these codes are showing up as pending. No vac leaks. Fuel pressure...
July 02, 2010
1998 Chevrolet Express 2500 4.3L Poor Idle Quality, Hesitation, MIL Lamp on VIN: 1GCFG25W51
P0171: Fuel Trim System Lean (Bank 1). ... misfire codes. It cuts out and runs poor until it goes into closed loop. Then it runs fine. Codes came on during closed loop= P0171 & P0174. Engine up to temp and driving around 25mph. Rear O2 not switching to good, ...
July 05, 2010
2005 Chevrolet Silverado 2500 HD 6.0L Poor Idle Quality, MIL Lamp on VIN: 1GCHC23U55
P0171: Fuel Trim System Lean (Bank 1). Hi All This vehicle is low miles but well used. The lean codes when cleared return within just a couple of minutes. When testing with the Tech 2, after resetting the fuel trim, the short term jumps up to 10-15 and the long term can be observed going up to max ...
July 07, 2010
1996 Chevrolet C1500 Suburban 5.7L MIL Lamp on VIN: 1GNFK16R0T
P0171: Fuel Trim System Lean (Bank 1). Vehicle came to my shop with 2 lean codes. I clear codes take on a 5 mile road test and right back soon. I have tried to clear the fuel trim and I can get it to go to sero. when i clear it goes to 128. Is that were it usualy starts? I recored freeze frame data...
July 12, 2010
1996 Ford F-250 XLT 7.5L MIL Lamp on VIN: 1FTHX26G8T
P0171: Bank 1 Too Lean. I'm getting lean codes P0171 and P0174. Also a P0153 for B2S1 O2 Sensor Slow Response. O2 Sensors are lazy, but switching. Long Term Fuel Trims are about 0-5% at idle and heavy acceleration, but at light acceleration and cruise, they jump up to 15-20%. I disco...
July 12, 2010
1998 Ford F-150 XLT 4.6L MIL Lamp on VIN: 1FTZX18WNA
P0171: lean bank 1. ... acceleration, pinging under light load, MIL. Initially had P0171 and P0174, lean codes. MAF reading scewed so replace MAF and air filter. Pinging gone and power back to normal. cust returned w/MIL. Found only P0171, lean bank 1. scan shows LT fuel trim at ...
July 14, 2010
2001 Oldsmobile Aurora 4.0L Misfire VIN: 1G3GS64C31
P0171: Fuel Trim System Lean. Car came in shop with ses on, has po171-po174 lean bank 1-2. check fuel pressure within spec, (42) psi althogh a little low for me. Monitored fuel trim and ho2s, fuel trim at the time of failure was 20. max spec is 23. check ho2s both switcheing 200-800 mv. re...
July 15, 2010
2004 Pontiac Grand Am SE 2.2L Poor Idle Quality, Surge, MIL Lamp on VIN: 1G2NE52F24
P0171: Fuel Trim System Lean. ... here with this one. This grand am came in to us a week ago with a p0507 idle control system code in it. Customer stated that car was surging on her at stop lights and as she would take off from the light also, but not all the time. We checked it out and th...
July 20, 2010
1996 Toyota Tacoma DLX 2.4L Hesitation, Misfire VIN: 4TAVL52N2T
P0171: Fuel System Too Lean (Bank 1). HELP!!!, this one has been a thorn in my side. Customer came in with no start. So original complaint is no start. Upon inspection found plugs to be fuel fouled, cap rotor needed replaced, and coil output was next to nothing. Replaced coil and all secondary ign...
July 20, 2010
2004 Pontiac Grand Am SE 2.2L Poor Idle Quality, Surge, MIL Lamp on VIN: 1G2NE52F24
P0171: Fuel Trim System Lean. ... here with this one. This grand am came in to us a week ago with a p0507 idle control system code in it. Customer stated that car was surging on her at stop lights and as she would take off from the light also, but not all the time. We checked it out and th...
July 21, 2010
2003 Mazda Protege ES 2.0L Poor Idle Quality, Surge, Misfire, MIL Lamp on VIN: JM1BJ22553
P0171: Adaptive Fuel Trim Too Lean (Bank 1). Hello, this vehicle came in for an overheat issue and found that it has a real hard time idling. Scanned the ecu and got 0300 misfire code, 0117 ect code(overheat), 0171 fuel system lean, also found that at normal operating temp. Fuel system is still in open ...
July 26, 2010
1999 Dodge Durango 5.2L Excessive Emissions, Poor Fuel Economy VIN: 1B4H528N3Y
P0171: Fuel System Lean (Bank 1). This thing runs rich...Black smokes and has lots of soot in the exh pipe...Has very poor milage... Was brought to me from another shop..they replaced both upstream O2's... this did not fix a thing...I can not find any vacume leaks...I am a Diesel guy not a gas...
July 27, 2010
2005 Ford Expedition Eddie Bauer 5.4L low power on accel VIN: 1FMFU17535
P0171: Bank 1 lean. Hello all, I have something driving me up the wall here. Being a GM tech for 19 years I recently switched to Ford. Please forgive my ignorance on ford products. I have a 2005 expedition, 5.4l, seems to be leaning out on Bank 1 under accel. I ran an OASIS o...
July 27, 2010
2001 Chevrolet Cavalier 2.2L Stall VIN: 1G1JC52471
P0171: Fuel System Lean (Bank 1). I may be chasing my tail with this one, if I recall it is probably an ignition switch however the problem is too intermittent to find. It will occur once and not again for some time. The car will occasionally stall when placed into gear, then restart immediate...
July 28, 2010
2001 Ford F-150 Lariat 5.4L MIL Lamp on, power loss VIN: 1FTRX08L51
P0171: lean bank 1. calling ford experts. i have a headache ford here. my question is, what exactly is the fuel pressure supposed to be? every source i can find says that it is supposed to be 30-45, but the way it behaves at that range, and the way it behaves now, indicates that...
July 29, 2010