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P0171 Diagnostic Trouble Code Discussion for November 2006

Fuel System Lean (Bank 1)


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Trouble Ticket Help Requests for DTC P0171
Help Request Posted
2001 Ford Windstar LX 3.8L MIL Lamp on VIN: 2FMZA514X1
P0171: Lean Bank1 Sensor 1. ... I'm going to try to make this short and sweet, so if you have any questions I will update. This van came in March 06', 83,700 miles with both P0171 and P0174, TSBs were noted but none of the problems stated in TSBs could be confirmed. The fuel filter was r...
November 03, 2006
2001 Ford Windstar LX 3.8L MIL Lamp on VIN: 2FMZA514X1
P0171: Lean Bank1 Sensor 1. ... I'm going to try to make this short and sweet, so if you have any questions I will update. This van came in March 06', 83,700 miles with both P0171 and P0174, TSBs were noted but none of the problems stated in TSBs could be confirmed. The fuel filter was r...
November 06, 2006
2000 Mercury Sable GS 3.0L Surge, MIL Lamp on VIN: 1MEFM58U3Y
P0171: system lean bank1. car came in with ses light on and some other unrelated complaints found large list of codes indicating fuel system wasn,t working well running system lean fuel pressure test came back with koeo 28 psi and koer about 8 psi so not even close to pressure spec. we...
November 08, 2006
2000 Mercury Sable GS 3.0L Surge, MIL Lamp on VIN: 1MEFM58U3Y
P0171: system lean bank1. car came in with ses light on and some other unrelated complaints found large list of codes indicating fuel system wasn,t working well running system lean fuel pressure test came back with koeo 28 psi and koer about 8 psi so not even close to pressure spec. we...
November 09, 2006
2005 Ford F-250 Super Duty Lariat 5.4L Misfire VIN: 1FTSX21545
P0171: . Misfire under hard acceleration, feels like loosing a plug. Checked one plug with great difficulity. Tried to gaulled the threads when removed. We are also going to preform an update Ford TSB O6-3-3,which states to replace with latest uopdated plugs. HAS A...
November 10, 2006
1998 Ford Explorer XL 4.0L MIL Lamp on VIN: 1FMZU32X5W
P0171: lean bank 1. I have a 98 explorer with po171 and po174. I have read all the post and i agreed with the intake oring problem. but I have only seen this on the SOHC motors and the recall only applys to the SOHC motors. Am i missing something i don't mind selling intake gaske...
November 15, 2006
2001 Audi A4 1.8L MIL Lamp on VIN: WAUDC68D91
P0171: system lean. We replace both o2 sensors and cleared the codes the next day the light came back on with two new codes, listed above, we are having trouble getting info on this. When we first looked at it on the scanner the o2's were doing nothing after replacing them they w...
November 16, 2006
2000 Mazda Protege ES 1.8L Trouble codes VIN: 1GCDT14Z7R
P0171: Adaptive Fuel Trim Too Lean (Bank 1). Hi Guys, This is an interesting one. Customer brought vehicle in because it failed inspection in NJ because of logged codes. I could find nothing wrong with the vehicle. I checked all connections and hoses. I them pulled the battery terminal to clear the code...
November 21, 2006
2000 Toyota Celica GT 1.8L Poor Idle Quality, Misfire VIN: JTDDR32TXY
P0171: Fuel System Too Lean (Bank 1). when first started cold, cyl 2 and 3 show heavy misfire. After a few seconds they come alive. Idle seems a little rough but the problem is when you take off, vehicle falls on its face, pops through intake with heavy spark knock. at higher rpm, the car seems to...
November 22, 2006
2003 Chevrolet Trailblazer North Face 4.2L Hesitation, Surge, Cuts out, Misfire, MIL Lamp on VIN: 1GNDT13S73
P0171: Fuel System Lean (Bank 1). Hi everybody this one has me twisted. Checked data stream and everything looks normal. vehicle holds back under accel. The more gas you give it the more it holds back. I actually got the vehicle to slow down going down hill while accelerating. There are no tra...
November 27, 2006
2000 Jaguar S-Type 3.0L MIL Lamp on VIN: SAJDA01C4Y
P0171: Lean Rt. bank. I have a vacuum leak at, what I think is the PCV valve plumbing under the back Left side of the Intake manifold. There is about a 3/8" poly tube coming from the throtle body area with manifold vacuum, it goes to the back Left of intake there is a rubber e...
November 28, 2006
1998 Lincoln Continental 4.6L Misfire VIN: 1LNFM97V0W
P0171: Lean Bank1. Vehicle came to shop w/ engine misfire & check engine light on. Initial inspection found fault codes for cylinder misfire in cylinder #3 & #4. Found long term fuel trim reading lean. Further inspection found barometer out of specs for altitude. Found M...
November 29, 2006
2000 Toyota Avalon XL 3.0L MIL Lamp on VIN: 4T1BF2874U
P0171: Fuel System Too Lean (Bank 1). ... one,this ones my mother inlaws car.every 2-3 months cel comes on with p0171 bank 1 lean.of coarse everytime she brings it in condition not present (go into check mode with scan tool which is surposed to disable 2 trip setting of code and road test with no ...
November 29, 2006
1997 Ford Ranger XL 4.0L p0171, p0174 VIN: 4F4CR16X8V
P0171: System lean bank one. Lean fuel trim codes are setting, but condition does NOT exist for these codes. First off, for those checking the VIN, yep... This is actually a Mazda B4000, but I wanted to get the attention of Ford guys on this one. Secondly, I know Ford and Ford fuel trim ...
November 30, 2006
2001 Lexus RX300 3.0L Excessive Emissions, Stall, Misfire, Poor Fuel Economy, MIL Lamp on VIN: JTJHF10U61
P0171: system lean bank 1. ... "jerking-chugging" and vehicle had become very hard on fuel. Dropped vehicle off at shop & 20 min. later would not start. Vehicle flooded almost instantly & would not clear itself. Did tune-up & vehicle started fine but ran poorly. L.T....
November 30, 2006
2001 Ford Windstar LX 3.8L MIL Lamp on VIN: 2FMZA514X1
P0171: Lean Bank1 Sensor 1. ... I'm going to try to make this short and sweet, so if you have any questions I will update. This van came in March 06', 83,700 miles with both P0171 and P0174, TSBs were noted but none of the problems stated in TSBs could be confirmed. The fuel filter was r...
November 03, 2006
2001 Ford Windstar LX 3.8L MIL Lamp on VIN: 2FMZA514X1
P0171: Lean Bank1 Sensor 1. ... I'm going to try to make this short and sweet, so if you have any questions I will update. This van came in March 06', 83,700 miles with both P0171 and P0174, TSBs were noted but none of the problems stated in TSBs could be confirmed. The fuel filter was r...
November 06, 2006
2000 Mercury Sable GS 3.0L Surge, MIL Lamp on VIN: 1MEFM58U3Y
P0171: system lean bank1. car came in with ses light on and some other unrelated complaints found large list of codes indicating fuel system wasn,t working well running system lean fuel pressure test came back with koeo 28 psi and koer about 8 psi so not even close to pressure spec. we...
November 08, 2006
2000 Mercury Sable GS 3.0L Surge, MIL Lamp on VIN: 1MEFM58U3Y
P0171: system lean bank1. car came in with ses light on and some other unrelated complaints found large list of codes indicating fuel system wasn,t working well running system lean fuel pressure test came back with koeo 28 psi and koer about 8 psi so not even close to pressure spec. we...
November 09, 2006
2005 Ford F-250 Super Duty Lariat 5.4L Misfire VIN: 1FTSX21545
P0171: . Misfire under hard acceleration, feels like loosing a plug. Checked one plug with great difficulity. Tried to gaulled the threads when removed. We are also going to preform an update Ford TSB O6-3-3,which states to replace with latest uopdated plugs. HAS A...
November 10, 2006
1998 Ford Explorer XL 4.0L MIL Lamp on VIN: 1FMZU32X5W
P0171: lean bank 1. I have a 98 explorer with po171 and po174. I have read all the post and i agreed with the intake oring problem. but I have only seen this on the SOHC motors and the recall only applys to the SOHC motors. Am i missing something i don't mind selling intake gaske...
November 15, 2006
2001 Audi A4 1.8L MIL Lamp on VIN: WAUDC68D91
P0171: system lean. We replace both o2 sensors and cleared the codes the next day the light came back on with two new codes, listed above, we are having trouble getting info on this. When we first looked at it on the scanner the o2's were doing nothing after replacing them they w...
November 16, 2006
2000 Mazda Protege ES 1.8L Trouble codes VIN: 1GCDT14Z7R
P0171: Adaptive Fuel Trim Too Lean (Bank 1). Hi Guys, This is an interesting one. Customer brought vehicle in because it failed inspection in NJ because of logged codes. I could find nothing wrong with the vehicle. I checked all connections and hoses. I them pulled the battery terminal to clear the code...
November 21, 2006
2000 Toyota Celica GT 1.8L Poor Idle Quality, Misfire VIN: JTDDR32TXY
P0171: Fuel System Too Lean (Bank 1). when first started cold, cyl 2 and 3 show heavy misfire. After a few seconds they come alive. Idle seems a little rough but the problem is when you take off, vehicle falls on its face, pops through intake with heavy spark knock. at higher rpm, the car seems to...
November 22, 2006
2003 Chevrolet Trailblazer North Face 4.2L Hesitation, Surge, Cuts out, Misfire, MIL Lamp on VIN: 1GNDT13S73
P0171: Fuel System Lean (Bank 1). Hi everybody this one has me twisted. Checked data stream and everything looks normal. vehicle holds back under accel. The more gas you give it the more it holds back. I actually got the vehicle to slow down going down hill while accelerating. There are no tra...
November 27, 2006
2000 Jaguar S-Type 3.0L MIL Lamp on VIN: SAJDA01C4Y
P0171: Lean Rt. bank. I have a vacuum leak at, what I think is the PCV valve plumbing under the back Left side of the Intake manifold. There is about a 3/8" poly tube coming from the throtle body area with manifold vacuum, it goes to the back Left of intake there is a rubber e...
November 28, 2006
1998 Lincoln Continental 4.6L Misfire VIN: 1LNFM97V0W
P0171: Lean Bank1. Vehicle came to shop w/ engine misfire & check engine light on. Initial inspection found fault codes for cylinder misfire in cylinder #3 & #4. Found long term fuel trim reading lean. Further inspection found barometer out of specs for altitude. Found M...
November 29, 2006
2000 Toyota Avalon XL 3.0L MIL Lamp on VIN: 4T1BF2874U
P0171: Fuel System Too Lean (Bank 1). ... one,this ones my mother inlaws car.every 2-3 months cel comes on with p0171 bank 1 lean.of coarse everytime she brings it in condition not present (go into check mode with scan tool which is surposed to disable 2 trip setting of code and road test with no ...
November 29, 2006
1997 Ford Ranger XL 4.0L p0171, p0174 VIN: 4F4CR16X8V
P0171: System lean bank one. Lean fuel trim codes are setting, but condition does NOT exist for these codes. First off, for those checking the VIN, yep... This is actually a Mazda B4000, but I wanted to get the attention of Ford guys on this one. Secondly, I know Ford and Ford fuel trim ...
November 30, 2006
2001 Lexus RX300 3.0L Excessive Emissions, Stall, Misfire, Poor Fuel Economy, MIL Lamp on VIN: JTJHF10U61
P0171: system lean bank 1. ... "jerking-chugging" and vehicle had become very hard on fuel. Dropped vehicle off at shop & 20 min. later would not start. Vehicle flooded almost instantly & would not clear itself. Did tune-up & vehicle started fine but ran poorly. L.T....
November 30, 2006