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P0171 Diagnostic Trouble Code Discussion for May 2012

Fuel System Lean (Bank 1)


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Trouble Ticket Help Requests for DTC P0171
Help Request Posted
2005 Audi A4 1.8L Poor Idle Quality, MIL Lamp on VIN: WAULC68E35
P0171: System lean bank 1. ... Came in with a leaking crankcase vent valve, and some broken breather hoses. We replaced the vent valve and the cracked hoses. The original codes were P0171 & Po507. The vehicle returned after a few days with a leaking ...
May 09, 2012
2007 Kia Rondo LX 2.7L MIL Lamp on VIN: KNAFG52647
P0171: system too lean bank1. ... and p0174, tested air mass meter by calculated load and was only getting 67% under full throttle, checked voltage reading at air mass meter and was getting approx. 2.4 volts @ 3,000 rpm's. So I relaced sensor with a delphi new unit. Test drove vehicle and ...
May 09, 2012
2003 Chevrolet Tracker ZR2 2.5L Poor Idle Quality, Stall VIN: 2CNBJ73463
P0171: lean condition. This tracker came to me second-hand after maf was replaced with after-market brand; customer didn't want spend 1200 dollars at GM dealer. The new maf did exactly the same as the factory original, engine would run poorly at idle and stall, down the road just fi...
May 10, 2012
2001 Nissan Sentra GXE 1.8L Poor Idle Quality, Hesitation, Surge, Cuts out, Stall, MIL Lamp on VIN: 3N1CB51D31
P0171: Fuel Trim Lean. The following week customer dropped off car and complained of rough idle at stops and cehck engine light came back on, scanned car and came up with a cat eff. Code removed cat. And found honeycomb melted, replaced cat, that took care of the cat eff. Code. Test...
May 10, 2012
2007 Kia Rondo LX 2.7L MIL Lamp on VIN: KNAFG52647
P0171: system too lean bank1. ... and p0174, tested air mass meter by calculated load and was only getting 67% under full throttle, checked voltage reading at air mass meter and was getting approx. 2.4 volts @ 3,000 rpm's. So I relaced sensor with a delphi new unit. Test drove vehicle and ...
May 11, 2012
2003 Jaguar S-Type 4.2L Excessive Emissions, Hesitation, Misfire, MIL Lamp on, reduced pwr display VIN: SAJGA03U13
P0171: exhaust lean bank 1. This car came in because it failed the emission test on friday. It came back today (monday) and the customer told us about the rough running on the highway. It will not accelerate to pass, it bucks then the reduced power display comes on and the MIL flashes. I...
May 14, 2012
1996 Buick Riviera 3.8L Poor Idle Quality, Misfire, MIL Lamp on, No power VIN: 1G4GD2212T
P0171: Fuel System Lean. The vehicle has little to no power. There are misfires recording on cylinders 2,4&6. 2&6 minimal misfires (200-400) with 4 being upwards of 10,000. New spark plugs, coils & module tested good with adequate spark, wires are good. Fuel pressure tests...
May 15, 2012
2002 Volkswagen Jetta GL 2.0L MIL Lamp on
P0171: lean condition. fail smog for ckeck engine light, p0171 lean condition emissions pass good, smoke test to find a vacuum leak found hoses under intake, change hoses and drove car and check engine came back again, same code, smoke test again no leaks check o2 sensor and test ok...
May 15, 2012
2001 BMW X5 3.0i 3.0L Poor Idle Quality VIN: WBAFA53581
P0171: System too lean bank1. Disconnected MAF runs well no stalling, swapped MAF no change, still lean with random misfire, checked oil seporator and found damaged hoses, replaced seporator, all 4 hoses, intake gaskets and suction jet pump for brakes (it was broken) reassembled engine aft...
May 19, 2012
2005 Dodge Magnum SXT 3.5L Hesitation, Stall, MIL Lamp on, Hard Start Cold VIN: 2D4FV48V55
P0171: b1 lean. ... replaced egr, upper intake gaskets and egr tube gasket. Car came back with just lean code p0171. Changed O2's (lazy). P0171 and P0174 showed up. Changed map sensor because map and barometric were not the same koeo. Car ran g...
May 22, 2012
2003 Suzuki Aerio SX 2.0L MIL Lamp on VIN: JS2RC41H73
P0171: Fuel System Too Lean (Bank 1). ... with the P0171 and high fuel trims I have been fighting it since. On a cold start up car runs poor low idle stalls.As it warms up it runs better and the trims are cut in half. When cold and the fuel trims are high you can hold it off idle and trims do not ...
May 23, 2012
2000 Toyota Corolla VE 1.8L Excessive Emissions, Poor Idle Quality, Hesitation, Surge, MIL Lamp on VIN: 1NXBR12E9Y
P0171: Fuel System Too Lean (Bank 1). ... activation and rough idle. 2 codes were stored P0171 and P0420. Long term trims were 16% idle and 30% part and mid throttle. Replaced mass airflow with Denso part and drove again. Trims all trended teards 0 but as I was driving I noticed engine would hesit...
May 23, 2012
2005 Mazda RX-8 1.3L No Start, Hesitation, Misfire VIN: JM1FE17N75
P0171: Adaptive Fuel Trim Too Lean (Bank 1). ... give me a problem im not familiar whit those cars, some other shop told the customer that the engine in bad; but when i did that clear flood procedure start good & ran i dont hear nothig in the engine but the catalystic converter get red red hot like i...
May 28, 2012
1999 Ford Windstar LX 3.8L MIL Lamp on VIN: 2FMZA5142X
P0171: bank 1 system lean. ... cel on dtc p0174/p0171 checked for leaks none found cust replaced maf sensor fuel pressure with in spec checked o2 sensor ok switching and responding when a rich condition is introduced lower intake plenum seals also replaced any help is appreciated
May 29, 2012
2001 Nissan Sentra GXE 1.8L Hesitation, MIL Lamp on VIN: 3N1CB51D71
P0171: Fuel Trim Lean. ... Check engine light is the main problem with P0171 but I have noiticed a power loss when moving the car cold intermittently like it is running out of fuel. Tested fuel pressure, within specs. Tested O2 sensors B1 and B2 individually with lab scope. Both are...
May 30, 2012
2005 Audi A4 1.8L Poor Idle Quality, MIL Lamp on VIN: WAULC68E35
P0171: System lean bank 1. ... Came in with a leaking crankcase vent valve, and some broken breather hoses. We replaced the vent valve and the cracked hoses. The original codes were P0171 & Po507. The vehicle returned after a few days with a leaking ...
May 09, 2012
2007 Kia Rondo LX 2.7L MIL Lamp on VIN: KNAFG52647
P0171: system too lean bank1. ... and p0174, tested air mass meter by calculated load and was only getting 67% under full throttle, checked voltage reading at air mass meter and was getting approx. 2.4 volts @ 3,000 rpm's. So I relaced sensor with a delphi new unit. Test drove vehicle and ...
May 09, 2012
2003 Chevrolet Tracker ZR2 2.5L Poor Idle Quality, Stall VIN: 2CNBJ73463
P0171: lean condition. This tracker came to me second-hand after maf was replaced with after-market brand; customer didn't want spend 1200 dollars at GM dealer. The new maf did exactly the same as the factory original, engine would run poorly at idle and stall, down the road just fi...
May 10, 2012
2001 Nissan Sentra GXE 1.8L Poor Idle Quality, Hesitation, Surge, Cuts out, Stall, MIL Lamp on VIN: 3N1CB51D31
P0171: Fuel Trim Lean. The following week customer dropped off car and complained of rough idle at stops and cehck engine light came back on, scanned car and came up with a cat eff. Code removed cat. And found honeycomb melted, replaced cat, that took care of the cat eff. Code. Test...
May 10, 2012
2007 Kia Rondo LX 2.7L MIL Lamp on VIN: KNAFG52647
P0171: system too lean bank1. ... and p0174, tested air mass meter by calculated load and was only getting 67% under full throttle, checked voltage reading at air mass meter and was getting approx. 2.4 volts @ 3,000 rpm's. So I relaced sensor with a delphi new unit. Test drove vehicle and ...
May 11, 2012
2003 Jaguar S-Type 4.2L Excessive Emissions, Hesitation, Misfire, MIL Lamp on, reduced pwr display VIN: SAJGA03U13
P0171: exhaust lean bank 1. This car came in because it failed the emission test on friday. It came back today (monday) and the customer told us about the rough running on the highway. It will not accelerate to pass, it bucks then the reduced power display comes on and the MIL flashes. I...
May 14, 2012
1996 Buick Riviera 3.8L Poor Idle Quality, Misfire, MIL Lamp on, No power VIN: 1G4GD2212T
P0171: Fuel System Lean. The vehicle has little to no power. There are misfires recording on cylinders 2,4&6. 2&6 minimal misfires (200-400) with 4 being upwards of 10,000. New spark plugs, coils & module tested good with adequate spark, wires are good. Fuel pressure tests...
May 15, 2012
2002 Volkswagen Jetta GL 2.0L MIL Lamp on
P0171: lean condition. fail smog for ckeck engine light, p0171 lean condition emissions pass good, smoke test to find a vacuum leak found hoses under intake, change hoses and drove car and check engine came back again, same code, smoke test again no leaks check o2 sensor and test ok...
May 15, 2012
2001 BMW X5 3.0i 3.0L Poor Idle Quality VIN: WBAFA53581
P0171: System too lean bank1. Disconnected MAF runs well no stalling, swapped MAF no change, still lean with random misfire, checked oil seporator and found damaged hoses, replaced seporator, all 4 hoses, intake gaskets and suction jet pump for brakes (it was broken) reassembled engine aft...
May 19, 2012
2005 Dodge Magnum SXT 3.5L Hesitation, Stall, MIL Lamp on, Hard Start Cold VIN: 2D4FV48V55
P0171: b1 lean. ... replaced egr, upper intake gaskets and egr tube gasket. Car came back with just lean code p0171. Changed O2's (lazy). P0171 and P0174 showed up. Changed map sensor because map and barometric were not the same koeo. Car ran g...
May 22, 2012
2003 Suzuki Aerio SX 2.0L MIL Lamp on VIN: JS2RC41H73
P0171: Fuel System Too Lean (Bank 1). ... with the P0171 and high fuel trims I have been fighting it since. On a cold start up car runs poor low idle stalls.As it warms up it runs better and the trims are cut in half. When cold and the fuel trims are high you can hold it off idle and trims do not ...
May 23, 2012
2000 Toyota Corolla VE 1.8L Excessive Emissions, Poor Idle Quality, Hesitation, Surge, MIL Lamp on VIN: 1NXBR12E9Y
P0171: Fuel System Too Lean (Bank 1). ... activation and rough idle. 2 codes were stored P0171 and P0420. Long term trims were 16% idle and 30% part and mid throttle. Replaced mass airflow with Denso part and drove again. Trims all trended teards 0 but as I was driving I noticed engine would hesit...
May 23, 2012
2005 Mazda RX-8 1.3L No Start, Hesitation, Misfire VIN: JM1FE17N75
P0171: Adaptive Fuel Trim Too Lean (Bank 1). ... give me a problem im not familiar whit those cars, some other shop told the customer that the engine in bad; but when i did that clear flood procedure start good & ran i dont hear nothig in the engine but the catalystic converter get red red hot like i...
May 28, 2012
1999 Ford Windstar LX 3.8L MIL Lamp on VIN: 2FMZA5142X
P0171: bank 1 system lean. ... cel on dtc p0174/p0171 checked for leaks none found cust replaced maf sensor fuel pressure with in spec checked o2 sensor ok switching and responding when a rich condition is introduced lower intake plenum seals also replaced any help is appreciated
May 29, 2012
2001 Nissan Sentra GXE 1.8L Hesitation, MIL Lamp on VIN: 3N1CB51D71
P0171: Fuel Trim Lean. ... Check engine light is the main problem with P0171 but I have noiticed a power loss when moving the car cold intermittently like it is running out of fuel. Tested fuel pressure, within specs. Tested O2 sensors B1 and B2 individually with lab scope. Both are...
May 30, 2012