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P0171 Diagnostic Trouble Code Discussion for January 2014

Fuel System Lean (Bank 1)


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Trouble Ticket Help Requests for DTC P0171
Help Request Posted
2001 Ford F-150 King Ranch 5.4L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1FTRW08L01
P0171: System lean bank 1. This vehicle is about to be released to the customer until the symptom becomes more apparent and consistent. It seems to occur more often when the weather is below freezing (32 deg). No freeze frame that indicates any input faults - all readings are belieavabl...
January 02, 2014
2002 Volvo S60 2.4L MIL Lamp on VIN: YV1RS61R32
P0171: system too lean bank 1. ... removed oil cap and noise went away. Replaced the pcv/oil seperator box and noise is gone. vehcile came back in with P0171. stft is at -26 while ltft is at +40 at idle. checked fuel pressure is at 55psi, checked for leaks with smoke and with propane none f...
January 02, 2014
1997 Ford Ranger XLT 4.0L Poor Idle Quality VIN: 1FTDR15X5V
P0171: bank 1 lean. Alright guy, everything about this is acting like a vacuum leak, running poorly at idle, smooths out off idle. my issue is that nothing is showing this (which of what I have read is common with this failure anyway), but my adaptives short and [...] term are st...
January 06, 2014
2002 Ford E-150 Econoline 4.2L MIL Lamp on VIN: 1FTRE14272
P0171: system too lean bank 1. found 2 codes,p0171 and p0174.recorded freeze frame p0171,load 20 ,ect 192,stft 0 and ltft bank 1 13.2. stft 0.7 and ltft 12.5 bank 2.rpm 1182,27mph. checked egr function, opened and stumbled. Smoke tested pcv capped, and found small leaking at both intake run...
January 08, 2014
2000 Lexus ES300 3.0L MIL Lamp on VIN: JT8BF28G3Y
P0171: Fuel System Too Lean (Bank 1). ... stumped... car initially came in for MIL light on and had P0171, P01130, P01133 after checking system out B1 S1 not working... dead, replaced with new air/fuel sensor test drove and P0171 popped up again, smoke tested it and found air intake tube had a tea...
January 09, 2014
2011 Chevrolet Cruze LT 1.4L high fuel trim VIN: 1G1PG5S96B
P0171: Lean condition. Freeze Frames (2- both simmilar) RPM 735-732 ECT 204-188 IAT 48-42 MAF 2.38 g/s Load 20% LTFT 31-35% MPH 0 My current scan tool readings agree with the above data. High long term fuel trim only at idle. Runs steady at 13ish, or 20ish, or 27ish. O2 sensor has...
January 10, 2014
2008 GMC Canyon WT 2.9L Cuts out, Stall, MIL Lamp on VIN: 1GTCS19908
P0171: Bank 1 lean. Started with just MIL on, Lean code, rapidly progressed to almost undriveable. What happens is on accel or brake torque in bay, at a certain point, engine will start running really bad, loose power, hesitate and buck. Oxy readings go full lean, like 15 MV. Rel...
January 14, 2014
2006 Land Rover Range Rover HSE 4.4L MIL Lamp on
P0171: system too lean bank 1. HI all, I have a problem with this 2006 range rover. IT is the 06 model with the jaguar engine. It runs, idles and drives faultlessly but the fault code returns almost immediately. I reset the codes and adaptations but they climb back to 20% on within a couple...
January 22, 2014
2003 Chrysler Town & Country LX 3.3L Excessive Emissions, Poor Idle Quality, Hesitation, Cuts out, Stall, Misfire, Poor Fuel Economy, MIL Lamp on VIN: 2C4GP44313
P0171: Fuel System Lean (Bank 1). Customer complaint of very hard start, decreased fuel mileage, misfiring, very rough idle starting last summer. Tune up and O2 sensor replaced at that time. Plugs were worn and O2 sensor not switching at all and pinned over 1v. Once repairs done, ran perfect a...
January 23, 2014
2004 Ford Freestar Limited 4.2L Misfire, MIL Lamp on VIN: 2FMZA58264
P0171: Lean bank 1. This one is eating our lunch, & we could sure use some help. Came in with the above codes, plus a p1000. We found intake leaking pretty severly from back side so upper & lower gaskets have been replaced, no vacuum leak now. Saw the tsb about water intr...
January 27, 2014
1999 Mazda 626 ES 2.5L Excessive Emissions, Poor Idle Quality, Hesitation, Surge, Poor Fuel Economy, MIL Lamp on VIN: 1YVGF22D1X
P0171: Adaptive Fuel Trim Too Lean (Bank 1). Hey fellas looking for a little help. Customer bought a craigslist lemon this mazda is always running poorly, has low engine vacuum, bank 1 is lean ltft 20% stft 28% bank 2 is rich ltft -20% stft -4%. The vacuum gauge fluctuates but all cylinders have 210 psi ...
January 28, 2014
2006 Infiniti G35 3.5L MIL Lamp on VIN: JNKCV51E96
P0171: Fuel Trim Lean (Bank 1). ... code P0171-system lean bank 1. Given it's a fairly new car with very low mileage and the good reliablility of these cars, I figured there might be a software issue, but couldn't find any updates for such a code. I did the basics, checked for vacuum leaks a...
January 31, 2014
2001 Ford F-150 King Ranch 5.4L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1FTRW08L01
P0171: System lean bank 1. This vehicle is about to be released to the customer until the symptom becomes more apparent and consistent. It seems to occur more often when the weather is below freezing (32 deg). No freeze frame that indicates any input faults - all readings are belieavabl...
January 02, 2014
2002 Volvo S60 2.4L MIL Lamp on VIN: YV1RS61R32
P0171: system too lean bank 1. ... removed oil cap and noise went away. Replaced the pcv/oil seperator box and noise is gone. vehcile came back in with P0171. stft is at -26 while ltft is at +40 at idle. checked fuel pressure is at 55psi, checked for leaks with smoke and with propane none f...
January 02, 2014
1997 Ford Ranger XLT 4.0L Poor Idle Quality VIN: 1FTDR15X5V
P0171: bank 1 lean. Alright guy, everything about this is acting like a vacuum leak, running poorly at idle, smooths out off idle. my issue is that nothing is showing this (which of what I have read is common with this failure anyway), but my adaptives short and [...] term are st...
January 06, 2014
2002 Ford E-150 Econoline 4.2L MIL Lamp on VIN: 1FTRE14272
P0171: system too lean bank 1. found 2 codes,p0171 and p0174.recorded freeze frame p0171,load 20 ,ect 192,stft 0 and ltft bank 1 13.2. stft 0.7 and ltft 12.5 bank 2.rpm 1182,27mph. checked egr function, opened and stumbled. Smoke tested pcv capped, and found small leaking at both intake run...
January 08, 2014
2000 Lexus ES300 3.0L MIL Lamp on VIN: JT8BF28G3Y
P0171: Fuel System Too Lean (Bank 1). ... stumped... car initially came in for MIL light on and had P0171, P01130, P01133 after checking system out B1 S1 not working... dead, replaced with new air/fuel sensor test drove and P0171 popped up again, smoke tested it and found air intake tube had a tea...
January 09, 2014
2011 Chevrolet Cruze LT 1.4L high fuel trim VIN: 1G1PG5S96B
P0171: Lean condition. Freeze Frames (2- both simmilar) RPM 735-732 ECT 204-188 IAT 48-42 MAF 2.38 g/s Load 20% LTFT 31-35% MPH 0 My current scan tool readings agree with the above data. High long term fuel trim only at idle. Runs steady at 13ish, or 20ish, or 27ish. O2 sensor has...
January 10, 2014
2008 GMC Canyon WT 2.9L Cuts out, Stall, MIL Lamp on VIN: 1GTCS19908
P0171: Bank 1 lean. Started with just MIL on, Lean code, rapidly progressed to almost undriveable. What happens is on accel or brake torque in bay, at a certain point, engine will start running really bad, loose power, hesitate and buck. Oxy readings go full lean, like 15 MV. Rel...
January 14, 2014
2006 Land Rover Range Rover HSE 4.4L MIL Lamp on
P0171: system too lean bank 1. HI all, I have a problem with this 2006 range rover. IT is the 06 model with the jaguar engine. It runs, idles and drives faultlessly but the fault code returns almost immediately. I reset the codes and adaptations but they climb back to 20% on within a couple...
January 22, 2014
2003 Chrysler Town & Country LX 3.3L Excessive Emissions, Poor Idle Quality, Hesitation, Cuts out, Stall, Misfire, Poor Fuel Economy, MIL Lamp on VIN: 2C4GP44313
P0171: Fuel System Lean (Bank 1). Customer complaint of very hard start, decreased fuel mileage, misfiring, very rough idle starting last summer. Tune up and O2 sensor replaced at that time. Plugs were worn and O2 sensor not switching at all and pinned over 1v. Once repairs done, ran perfect a...
January 23, 2014
2004 Ford Freestar Limited 4.2L Misfire, MIL Lamp on VIN: 2FMZA58264
P0171: Lean bank 1. This one is eating our lunch, & we could sure use some help. Came in with the above codes, plus a p1000. We found intake leaking pretty severly from back side so upper & lower gaskets have been replaced, no vacuum leak now. Saw the tsb about water intr...
January 27, 2014
1999 Mazda 626 ES 2.5L Excessive Emissions, Poor Idle Quality, Hesitation, Surge, Poor Fuel Economy, MIL Lamp on VIN: 1YVGF22D1X
P0171: Adaptive Fuel Trim Too Lean (Bank 1). Hey fellas looking for a little help. Customer bought a craigslist lemon this mazda is always running poorly, has low engine vacuum, bank 1 is lean ltft 20% stft 28% bank 2 is rich ltft -20% stft -4%. The vacuum gauge fluctuates but all cylinders have 210 psi ...
January 28, 2014
2006 Infiniti G35 3.5L MIL Lamp on VIN: JNKCV51E96
P0171: Fuel Trim Lean (Bank 1). ... code P0171-system lean bank 1. Given it's a fairly new car with very low mileage and the good reliablility of these cars, I figured there might be a software issue, but couldn't find any updates for such a code. I did the basics, checked for vacuum leaks a...
January 31, 2014
2001 Ford F-150 King Ranch 5.4L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1FTRW08L01
P0171: System lean bank 1. This vehicle is about to be released to the customer until the symptom becomes more apparent and consistent. It seems to occur more often when the weather is below freezing (32 deg). No freeze frame that indicates any input faults - all readings are belieavabl...
January 02, 2014
2002 Volvo S60 2.4L MIL Lamp on VIN: YV1RS61R32
P0171: system too lean bank 1. ... removed oil cap and noise went away. Replaced the pcv/oil seperator box and noise is gone. vehcile came back in with P0171. stft is at -26 while ltft is at +40 at idle. checked fuel pressure is at 55psi, checked for leaks with smoke and with propane none f...
January 02, 2014
1997 Ford Ranger XLT 4.0L Poor Idle Quality VIN: 1FTDR15X5V
P0171: bank 1 lean. Alright guy, everything about this is acting like a vacuum leak, running poorly at idle, smooths out off idle. my issue is that nothing is showing this (which of what I have read is common with this failure anyway), but my adaptives short and [...] term are st...
January 06, 2014
2002 Ford E-150 Econoline 4.2L MIL Lamp on VIN: 1FTRE14272
P0171: system too lean bank 1. found 2 codes,p0171 and p0174.recorded freeze frame p0171,load 20 ,ect 192,stft 0 and ltft bank 1 13.2. stft 0.7 and ltft 12.5 bank 2.rpm 1182,27mph. checked egr function, opened and stumbled. Smoke tested pcv capped, and found small leaking at both intake run...
January 08, 2014
2000 Lexus ES300 3.0L MIL Lamp on VIN: JT8BF28G3Y
P0171: Fuel System Too Lean (Bank 1). ... stumped... car initially came in for MIL light on and had P0171, P01130, P01133 after checking system out B1 S1 not working... dead, replaced with new air/fuel sensor test drove and P0171 popped up again, smoke tested it and found air intake tube had a tea...
January 09, 2014
2011 Chevrolet Cruze LT 1.4L high fuel trim VIN: 1G1PG5S96B
P0171: Lean condition. Freeze Frames (2- both simmilar) RPM 735-732 ECT 204-188 IAT 48-42 MAF 2.38 g/s Load 20% LTFT 31-35% MPH 0 My current scan tool readings agree with the above data. High long term fuel trim only at idle. Runs steady at 13ish, or 20ish, or 27ish. O2 sensor has...
January 10, 2014
2008 GMC Canyon WT 2.9L Cuts out, Stall, MIL Lamp on VIN: 1GTCS19908
P0171: Bank 1 lean. Started with just MIL on, Lean code, rapidly progressed to almost undriveable. What happens is on accel or brake torque in bay, at a certain point, engine will start running really bad, loose power, hesitate and buck. Oxy readings go full lean, like 15 MV. Rel...
January 14, 2014
2006 Land Rover Range Rover HSE 4.4L MIL Lamp on
P0171: system too lean bank 1. HI all, I have a problem with this 2006 range rover. IT is the 06 model with the jaguar engine. It runs, idles and drives faultlessly but the fault code returns almost immediately. I reset the codes and adaptations but they climb back to 20% on within a couple...
January 22, 2014
2003 Chrysler Town & Country LX 3.3L Excessive Emissions, Poor Idle Quality, Hesitation, Cuts out, Stall, Misfire, Poor Fuel Economy, MIL Lamp on VIN: 2C4GP44313
P0171: Fuel System Lean (Bank 1). Customer complaint of very hard start, decreased fuel mileage, misfiring, very rough idle starting last summer. Tune up and O2 sensor replaced at that time. Plugs were worn and O2 sensor not switching at all and pinned over 1v. Once repairs done, ran perfect a...
January 23, 2014
2004 Ford Freestar Limited 4.2L Misfire, MIL Lamp on VIN: 2FMZA58264
P0171: Lean bank 1. This one is eating our lunch, & we could sure use some help. Came in with the above codes, plus a p1000. We found intake leaking pretty severly from back side so upper & lower gaskets have been replaced, no vacuum leak now. Saw the tsb about water intr...
January 27, 2014
1999 Mazda 626 ES 2.5L Excessive Emissions, Poor Idle Quality, Hesitation, Surge, Poor Fuel Economy, MIL Lamp on VIN: 1YVGF22D1X
P0171: Adaptive Fuel Trim Too Lean (Bank 1). Hey fellas looking for a little help. Customer bought a craigslist lemon this mazda is always running poorly, has low engine vacuum, bank 1 is lean ltft 20% stft 28% bank 2 is rich ltft -20% stft -4%. The vacuum gauge fluctuates but all cylinders have 210 psi ...
January 28, 2014
2006 Infiniti G35 3.5L MIL Lamp on VIN: JNKCV51E96
P0171: Fuel Trim Lean (Bank 1). ... code P0171-system lean bank 1. Given it's a fairly new car with very low mileage and the good reliablility of these cars, I figured there might be a software issue, but couldn't find any updates for such a code. I did the basics, checked for vacuum leaks a...
January 31, 2014