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P0171 Diagnostic Trouble Code Discussion for December 2009

Fuel System Lean (Bank 1)


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Trouble Ticket Help Requests for DTC P0171
Help Request Posted
2000 Chevrolet K3500 7.4L Hesitation, Misfire, MIL Lamp on VIN: 1GCHK33J6Y
P0171: Fuel Trim System Lean (Bank 1). ... here. the truck misses and lacks power under heavy acceleration. On scanner it shows constant misfire on #3 cylinder, yet only code present is p0171. When I look at fuel trim it shows only 5% long term fuel trim on bank 1. during injector balance tests we ...
December 04, 2009
2003 Toyota Highlander 2.4L Excessive Emissions, MIL Lamp on VIN: JTEGD21A03
P0171: Fuel System Too Lean (Bank 1). ... engine lite on-p0420-p0430-p0171--the owners had the converter replaced-looks like one big manifold cat--the maf sensor was soo dirty it would not clean up-so i replaced it for the code p0171-but i go to sniff the car and it still runs rich so i cant smog ...
December 04, 2009
2002 BMW 530i 3.0L Poor Idle Quality, Hesitation, Misfire, MIL Lamp on VIN: WBADT53492
P0171: system to lean bank 1. ... code was P0174 System Too Lean Bank 2 Changed B1 Pre-Cat O2 sensor and reset. Vehicle runs rough/stumbles/misfires throws MIL lamp and smooths out. Usually occurs when sitting at a long light Then the following codes: P0300 Random Misfire P1351 Misfire C...
December 05, 2009
2002 Ford F-150 XL 4.2L Cuts out, MIL Lamp on VIN: 1FTRF17252
P0171: lean bank 1. lean bank 1&2 codes is all i got but engine still has a slight ign. miss (stutter)on acceleration. i have checked the codes many times in last 8 to 12 months for customer and before and after all the maintinance he has done we still get & only get lean...
December 05, 2009
2000 Chevrolet K3500 7.4L Hesitation, Misfire, MIL Lamp on VIN: 1GCHK33J6Y
P0171: Fuel Trim System Lean (Bank 1). ... here. the truck misses and lacks power under heavy acceleration. On scanner it shows constant misfire on #3 cylinder, yet only code present is p0171. When I look at fuel trim it shows only 5% long term fuel trim on bank 1. during injector balance tests we ...
December 08, 2009
2004 Ford Taurus SE 3.0L MIL Lamp on VIN: 1FAFP53224
P0171: lean bank 1. ... for its 3rd. visit with the check engine light on.First 2 visits it had (2)codes stored p0171 & p0174.Both time both codes were only stored in memory and unable to duplicate.Checked for...
December 14, 2009
2000 Toyota Celica GT 1.8L Poor Idle Quality, Hesitation, Cuts out, Misfire, MIL Lamp on VIN: JTDDR32T5Y
P0171: Fuel System Too Lean (Bank 1). Vehicle came in running rough with lack of power. Cleaned MAF sensor and got a little better. Removed battery cables to clean posts and after restarting motor ran terrible. Now has extreme lack of power, feels like retarded timing but timing is at 16 degrees a...
December 14, 2009
1998 Chevrolet K1500 Cheyenne 5.7L Cuts out VIN: 1GTEK19R1W
P0171: Fuel Trim System Lean (Bank 1). First of all, sorry for the long post. Customer concern is that if engine is started and driven immediately it has no power and cuts out. If you let it run for a few minutes it runs fine. The "Service Engine Soon" light is on all the time with the code...
December 15, 2009
2003 BMW 330i 3.0L Poor Idle Quality, MIL Lamp on VIN: WBAV53473K
Has lean mixture, pending po171 & po174 codes; no obvious vacuum leaks
December 16, 2009
1998 Chevrolet K1500 Cheyenne 5.7L Misfire VIN: 1GCEK19R6W
P0171: Fuel Trim System Lean (Bank 1). this truck starts up fine, idles fine, as it warms up it slowly looses power in which it won't rev up. the maximum rpm's it will go keep decreasing to it finally won't rev past 3500 rpm's. when it finally reaches max rpm it breaks up and sometimes pops under i...
December 16, 2009
1993 Toyota Pickup 3.0L MIL Lamp on VIN: JT4VN13GXP
P0171: Lean Exhaust. OK, this is a 93 pickup with a federal 2000 3.4L Tacoma engine swapped in. Having serious trouble with fuel trim(+30%) at all RPM ranges. Tried replacing multiple components, MAF, plugs, bumped fuel pressure with aftermarket regulator, O2S. What am I missing!?...
December 16, 2009
2003 Jaguar X-Type 3.0L Poor Idle Quality, Cuts out, Misfire, MIL Lamp on VIN: SAJEA51C43
P0171: Lean bank one. Symptom of very rough idle and missfire during warm-up, MIL flashes upon attempting to accelerate while in park. After at least 50% warmed up engine starts to smooth out and MIL quits flashing. Cleared all codes but all return within a day or so. Engine runs w...
December 29, 2009
1998 Toyota T100 3.4L Excessive Emissions, Poor Idle Quality, Hesitation, Cuts out, Stall, Misfire, Poor Fuel Economy, MIL Lamp on VIN: JT4TN14D4W
P0171: Fuel System Too Lean (Bank 1). Have this truck here for the first time. It looks like someone has put on two new oxygen sensors. It runs smooth for about 5 seconds after you start it. It immediately starts to stumble very badly and then dies. I thought maybe the cat was plugged. I put a pre...
December 29, 2009
2000 Chevrolet Prizm 1.8L MIL Lamp on VIN: 1Y1SK5280Y
P0171: system too lean bank 1. Customer has had this recurring P0171 code for the past 1 year or so. Upstream and downstream O2 sensors have been replaced as well as spark plugs. Came to me and I performed smoke test to see if vacuum leak was the cause - no leak noted. As you drive the car ...
December 30, 2009
2000 Chevrolet K3500 7.4L Hesitation, Misfire, MIL Lamp on VIN: 1GCHK33J6Y
P0171: Fuel Trim System Lean (Bank 1). ... here. the truck misses and lacks power under heavy acceleration. On scanner it shows constant misfire on #3 cylinder, yet only code present is p0171. When I look at fuel trim it shows only 5% long term fuel trim on bank 1. during injector balance tests we ...
December 04, 2009
2003 Toyota Highlander 2.4L Excessive Emissions, MIL Lamp on VIN: JTEGD21A03
P0171: Fuel System Too Lean (Bank 1). ... engine lite on-p0420-p0430-p0171--the owners had the converter replaced-looks like one big manifold cat--the maf sensor was soo dirty it would not clean up-so i replaced it for the code p0171-but i go to sniff the car and it still runs rich so i cant smog ...
December 04, 2009
2002 BMW 530i 3.0L Poor Idle Quality, Hesitation, Misfire, MIL Lamp on VIN: WBADT53492
P0171: system to lean bank 1. ... code was P0174 System Too Lean Bank 2 Changed B1 Pre-Cat O2 sensor and reset. Vehicle runs rough/stumbles/misfires throws MIL lamp and smooths out. Usually occurs when sitting at a long light Then the following codes: P0300 Random Misfire P1351 Misfire C...
December 05, 2009
2002 Ford F-150 XL 4.2L Cuts out, MIL Lamp on VIN: 1FTRF17252
P0171: lean bank 1. lean bank 1&2 codes is all i got but engine still has a slight ign. miss (stutter)on acceleration. i have checked the codes many times in last 8 to 12 months for customer and before and after all the maintinance he has done we still get & only get lean...
December 05, 2009
2000 Chevrolet K3500 7.4L Hesitation, Misfire, MIL Lamp on VIN: 1GCHK33J6Y
P0171: Fuel Trim System Lean (Bank 1). ... here. the truck misses and lacks power under heavy acceleration. On scanner it shows constant misfire on #3 cylinder, yet only code present is p0171. When I look at fuel trim it shows only 5% long term fuel trim on bank 1. during injector balance tests we ...
December 08, 2009
2004 Ford Taurus SE 3.0L MIL Lamp on VIN: 1FAFP53224
P0171: lean bank 1. ... for its 3rd. visit with the check engine light on.First 2 visits it had (2)codes stored p0171 & p0174.Both time both codes were only stored in memory and unable to duplicate.Checked for...
December 14, 2009
2000 Toyota Celica GT 1.8L Poor Idle Quality, Hesitation, Cuts out, Misfire, MIL Lamp on VIN: JTDDR32T5Y
P0171: Fuel System Too Lean (Bank 1). Vehicle came in running rough with lack of power. Cleaned MAF sensor and got a little better. Removed battery cables to clean posts and after restarting motor ran terrible. Now has extreme lack of power, feels like retarded timing but timing is at 16 degrees a...
December 14, 2009
1998 Chevrolet K1500 Cheyenne 5.7L Cuts out VIN: 1GTEK19R1W
P0171: Fuel Trim System Lean (Bank 1). First of all, sorry for the long post. Customer concern is that if engine is started and driven immediately it has no power and cuts out. If you let it run for a few minutes it runs fine. The "Service Engine Soon" light is on all the time with the code...
December 15, 2009
2003 BMW 330i 3.0L Poor Idle Quality, MIL Lamp on VIN: WBAV53473K
Has lean mixture, pending po171 & po174 codes; no obvious vacuum leaks
December 16, 2009
1998 Chevrolet K1500 Cheyenne 5.7L Misfire VIN: 1GCEK19R6W
P0171: Fuel Trim System Lean (Bank 1). this truck starts up fine, idles fine, as it warms up it slowly looses power in which it won't rev up. the maximum rpm's it will go keep decreasing to it finally won't rev past 3500 rpm's. when it finally reaches max rpm it breaks up and sometimes pops under i...
December 16, 2009
1993 Toyota Pickup 3.0L MIL Lamp on VIN: JT4VN13GXP
P0171: Lean Exhaust. OK, this is a 93 pickup with a federal 2000 3.4L Tacoma engine swapped in. Having serious trouble with fuel trim(+30%) at all RPM ranges. Tried replacing multiple components, MAF, plugs, bumped fuel pressure with aftermarket regulator, O2S. What am I missing!?...
December 16, 2009
2003 Jaguar X-Type 3.0L Poor Idle Quality, Cuts out, Misfire, MIL Lamp on VIN: SAJEA51C43
P0171: Lean bank one. Symptom of very rough idle and missfire during warm-up, MIL flashes upon attempting to accelerate while in park. After at least 50% warmed up engine starts to smooth out and MIL quits flashing. Cleared all codes but all return within a day or so. Engine runs w...
December 29, 2009
1998 Toyota T100 3.4L Excessive Emissions, Poor Idle Quality, Hesitation, Cuts out, Stall, Misfire, Poor Fuel Economy, MIL Lamp on VIN: JT4TN14D4W
P0171: Fuel System Too Lean (Bank 1). Have this truck here for the first time. It looks like someone has put on two new oxygen sensors. It runs smooth for about 5 seconds after you start it. It immediately starts to stumble very badly and then dies. I thought maybe the cat was plugged. I put a pre...
December 29, 2009
2000 Chevrolet Prizm 1.8L MIL Lamp on VIN: 1Y1SK5280Y
P0171: system too lean bank 1. Customer has had this recurring P0171 code for the past 1 year or so. Upstream and downstream O2 sensors have been replaced as well as spark plugs. Came to me and I performed smoke test to see if vacuum leak was the cause - no leak noted. As you drive the car ...
December 30, 2009