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P0171 Diagnostic Trouble Code Discussion for June 2008

Fuel System Lean (Bank 1)


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Trouble Ticket Help Requests for DTC P0171
Help Request Posted
2002 Ford Explorer Sport 4.0L Poor Idle Quality, Misfire, Poor Fuel Economy, MIL Lamp on VIN: 1FMZU7OE62
P0171: lean bank 1. vehicle runs verry rough at low rpm(idle). please give all suggestions
June 02, 2008
2001 Lexus IS300 3.0L Hesitation, MIL Lamp on VIN: JTHBDN1826
P0171: Fuel System Too Lean (Bank 1). ... 3500 rpms and just wont go! At frist thought it was a easy fix seen codes p0171 & p0174 lean banks, so I got a denso mass air meter, and same problem the car will not accel, but now i ...
June 04, 2008
2002 Mazda Protege DX 2.0L MIL Lamp on VIN: JM1BJ2228Y
P0171: Adaptive Fuel Trim Too Lean (Bank 1). Car came in with a check engine light...fuel trim b1 was at 0% at idle but off idle or while driving the fuel trim was 25%...replaced intake gasket due to tsb and it was leaking per smoke test...now my trims are 13% at idle and 25 under load...tested upstream ...
June 09, 2008
2000 Dodge Durango 4.7L Excessive Emissions, MIL Lamp on VIN: 1B4HS28N3Y
P0171: Fuel System Lean (Bank 1). Need some Dodge help! This vehicle came in with PO171 lean code black smoke out of exhaust diagnosted as bad o2 sensor replaced sensor looked at data it seemed good returned truck to customer. About one week later truck came back same symptoms again diagnosted...
June 10, 2008
2000 Saturn LS2 3.0L service engine soon VIN: 1G8JW52R4Y
P0171: Fuel Trim System Lean (Bank 1). The service engine soon light is on, after diconecting the battery while cleaning the mass air sensor the light went out but still read the same codes and sfter about 6 restarts the light came back on. The car seems to run fine, smooth idle, good power but the...
June 10, 2008
2003 Chrysler Town & Country (Van) LXi 3.8L MIL Lamp on VIN: 2C4GP54L53
P0171: 1/1 fuel system too lean. i have a 3.8 chrysler driving me to the poor house, sets lean code almost imediatly, have searched for vac leak cold and hot with smoke and with added fuel while watching fuel trims, no luck. checked fuel pressure over and over 59 lbs, volumne also good, have ...
June 11, 2008
2002 Dodge Ram 1500 Truck 3.7L MIL Lamp on VIN: 1D7HA16K62
P0171: Fuel System Lean (Bank 1). truck came in with ses light on had code po171 lean and po133 which is 02 slow response,replaced 02 sensor still has same problem,i back probed pcm 02 signal wire black/green and found 0.00 02 volts,checked wire from pcm to 02 harness and found open when i loo...
June 11, 2008
2001 Nissan Pathfinder LE 3.5L MIL Lamp on VIN: JN8DR09Y21
P0171: Fuel Trim Lean (Bank 1). after 30 miles of driving mil light comes on with trouble code po171. smoked the intake - no vacuum leaks found, fuel pressure ok. o2 sensors ok - i suspect the mass air flow sensor but when testing: 4 g/s at idle, 10 g/s at 2500 rpm within test limits. i also...
June 11, 2008
2001 Cadillac DeVille 4.6L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1G5KD54Y11
P0171: Fuel Trim System Lean (Bank 1). Hello Everyone, I have this cadillac deville with a 4.6 and it came in with a check engine light on. I did some testing and came to determine the crank sensors were faulty. replaced them and still have the same problem. About a week a go i replaced the spark ...
June 12, 2008
1996 Cadillac DeVille 4.6L MIL Lamp on VIN: 1G6KD52Y9T
P0171: Fuel Trim System Lean (Bank 1). ... and ses light on, originally. 6 codes stored po171, po174, po131, po138, po151,p1139. fixed poor run with plugs, wires, and fuel filter and cleared codes. (hoped repair would eliminate some codes) vehicle returned with same...
June 25, 2008
2004 Mercury Monterey (Van) 4.2L Misfire VIN: 2MRDA20224
P0171: Bank 1 Lean. ... car came in 2 months ago for a misfire in #2 cylinder. we don't have an adequate ignition scope but it was obviously an ignition miss that was easily reproduced under load. we replaced plugs and wire set with Motorcraft parts, test drove car and miss was g...
June 26, 2008
1996 Ford Windstar GL 3.8L Poor Idle Quality, Hesitation, Surge, Cuts out, Stall, Misfire, Poor Fuel Economy, MIL Lamp on VIN: 2FMDA5143T
P0171: bank 1 lean. ... says they can drive it forever and it runs great. however, when they shut it off and let it sit for 10 to 15 minutes it idles rough and wants to stall. it had dtc p0171 and p0174. both codes were continuous memory. no code...
June 27, 2008
2000 Nissan Sentra GXE 1.8L Hesitation, Surge, Cuts out VIN: 3N1CB51D4Y
P0171: Fuel Trim Lean. Hey Nissan guys - this car just came to me, barely running, customer has rigged a push button for starter? don't know why? has poor power always - O2 sensors read .02-.04V all the time (lean right) they will artificial richen, sensors OK - removed fuel pump &a...
June 28, 2008
2002 Ford Explorer Sport 4.0L Poor Idle Quality, Misfire, Poor Fuel Economy, MIL Lamp on VIN: 1FMZU7OE62
P0171: lean bank 1. vehicle runs verry rough at low rpm(idle). please give all suggestions
June 02, 2008
2001 Lexus IS300 3.0L Hesitation, MIL Lamp on VIN: JTHBDN1826
P0171: Fuel System Too Lean (Bank 1). ... 3500 rpms and just wont go! At frist thought it was a easy fix seen codes p0171 & p0174 lean banks, so I got a denso mass air meter, and same problem the car will not accel, but now i ...
June 04, 2008
2002 Mazda Protege DX 2.0L MIL Lamp on VIN: JM1BJ2228Y
P0171: Adaptive Fuel Trim Too Lean (Bank 1). Car came in with a check engine light...fuel trim b1 was at 0% at idle but off idle or while driving the fuel trim was 25%...replaced intake gasket due to tsb and it was leaking per smoke test...now my trims are 13% at idle and 25 under load...tested upstream ...
June 09, 2008
2000 Dodge Durango 4.7L Excessive Emissions, MIL Lamp on VIN: 1B4HS28N3Y
P0171: Fuel System Lean (Bank 1). Need some Dodge help! This vehicle came in with PO171 lean code black smoke out of exhaust diagnosted as bad o2 sensor replaced sensor looked at data it seemed good returned truck to customer. About one week later truck came back same symptoms again diagnosted...
June 10, 2008
2000 Saturn LS2 3.0L service engine soon VIN: 1G8JW52R4Y
P0171: Fuel Trim System Lean (Bank 1). The service engine soon light is on, after diconecting the battery while cleaning the mass air sensor the light went out but still read the same codes and sfter about 6 restarts the light came back on. The car seems to run fine, smooth idle, good power but the...
June 10, 2008
2003 Chrysler Town & Country (Van) LXi 3.8L MIL Lamp on VIN: 2C4GP54L53
P0171: 1/1 fuel system too lean. i have a 3.8 chrysler driving me to the poor house, sets lean code almost imediatly, have searched for vac leak cold and hot with smoke and with added fuel while watching fuel trims, no luck. checked fuel pressure over and over 59 lbs, volumne also good, have ...
June 11, 2008
2002 Dodge Ram 1500 Truck 3.7L MIL Lamp on VIN: 1D7HA16K62
P0171: Fuel System Lean (Bank 1). truck came in with ses light on had code po171 lean and po133 which is 02 slow response,replaced 02 sensor still has same problem,i back probed pcm 02 signal wire black/green and found 0.00 02 volts,checked wire from pcm to 02 harness and found open when i loo...
June 11, 2008
2001 Nissan Pathfinder LE 3.5L MIL Lamp on VIN: JN8DR09Y21
P0171: Fuel Trim Lean (Bank 1). after 30 miles of driving mil light comes on with trouble code po171. smoked the intake - no vacuum leaks found, fuel pressure ok. o2 sensors ok - i suspect the mass air flow sensor but when testing: 4 g/s at idle, 10 g/s at 2500 rpm within test limits. i also...
June 11, 2008
2001 Cadillac DeVille 4.6L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1G5KD54Y11
P0171: Fuel Trim System Lean (Bank 1). Hello Everyone, I have this cadillac deville with a 4.6 and it came in with a check engine light on. I did some testing and came to determine the crank sensors were faulty. replaced them and still have the same problem. About a week a go i replaced the spark ...
June 12, 2008
1996 Cadillac DeVille 4.6L MIL Lamp on VIN: 1G6KD52Y9T
P0171: Fuel Trim System Lean (Bank 1). ... and ses light on, originally. 6 codes stored po171, po174, po131, po138, po151,p1139. fixed poor run with plugs, wires, and fuel filter and cleared codes. (hoped repair would eliminate some codes) vehicle returned with same...
June 25, 2008
2004 Mercury Monterey (Van) 4.2L Misfire VIN: 2MRDA20224
P0171: Bank 1 Lean. ... car came in 2 months ago for a misfire in #2 cylinder. we don't have an adequate ignition scope but it was obviously an ignition miss that was easily reproduced under load. we replaced plugs and wire set with Motorcraft parts, test drove car and miss was g...
June 26, 2008
1996 Ford Windstar GL 3.8L Poor Idle Quality, Hesitation, Surge, Cuts out, Stall, Misfire, Poor Fuel Economy, MIL Lamp on VIN: 2FMDA5143T
P0171: bank 1 lean. ... says they can drive it forever and it runs great. however, when they shut it off and let it sit for 10 to 15 minutes it idles rough and wants to stall. it had dtc p0171 and p0174. both codes were continuous memory. no code...
June 27, 2008
2000 Nissan Sentra GXE 1.8L Hesitation, Surge, Cuts out VIN: 3N1CB51D4Y
P0171: Fuel Trim Lean. Hey Nissan guys - this car just came to me, barely running, customer has rigged a push button for starter? don't know why? has poor power always - O2 sensors read .02-.04V all the time (lean right) they will artificial richen, sensors OK - removed fuel pump &a...
June 28, 2008