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P0171 Diagnostic Trouble Code Discussion for May 2004

Fuel System Lean (Bank 1)


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Trouble Ticket Help Requests for DTC P0171
Help Request Posted
1997 Ford F-150 Lariat 4.6L MIL Lamp on VIN: 1FTDX18W8V
P0171: right bank fuel system lean. Hello we have a ford f-150 that has both banks coming up with lean codes.The maf has been replaced,both upstream o2 sensors,the fuel trims are in the normal range at cruise speeds,but at idle the trims go to the - limit and read error. We have checked visably ...
May 05, 2004
2000 Dodge Durango 4.7L Excessive Emissions, Poor Fuel Economy, MIL Lamp on VIN: 1B4HS28N0Y
P0171: Fuel System Lean (Bank 1). O2 sensor full of black soot, non responsive, for the second time in 500 miles. Running full rich. Appears to be seeping oil out of the top of the sensor. Do the 4.7 motors have a problem fouling the O2 sensor? There are no vacuum leaks that we can find.
May 06, 2004
1996 Ford F-150 Special 5.0L Poor Fuel Economy, MIL Lamp on VIN: 1FTF15M5TL
P0171: bank one lean. ... where all repairs were made new o2 sensors pcm cts fuel filter injectors cleaned plugs wires cap rotor, problem still occurs. when first driving truck o2 sensors stfuel lt fuel all appear normal after about 6 miles code p1000 will erace and codes will rese...
May 07, 2004
1997 Ford Explorer Eddie Bauer 4.0L Misfire VIN: 1FMDU32E8V
P0171: sys too lean bank 1. I am having a difficult time diagnosing this vehicle. I know I have one bad injector. Cylinder 2 and 6 misfire at an idle, and clean up with higher rpm. B2s1 will intermittenly stay lean. while the rear responds correctly. I also used the vantage to check the ...
May 10, 2004
2000 Dodge Neon ES 2.0L Misfire, MIL Lamp on VIN: 1B3ES46CXY
P0171: Fuel System Lean (Bank 1). hi. It goes like this. damsel in distress stating that her car started bucking/jerking losing power but healed itself enough to get to the shop. a quick scan test revealed a history code 39 starts ago [po340].running fine at this time.while monitoring scan dat...
May 11, 2004
1997 Ford Explorer Eddie Bauer 4.0L Misfire VIN: 1FMDU32E8V
P0171: sys too lean bank 1. I am having a difficult time diagnosing this vehicle. I know I have one bad injector. Cylinder 2 and 6 misfire at an idle, and clean up with higher rpm. B2s1 will intermittenly stay lean. while the rear responds correctly. I also used the vantage to check the ...
May 11, 2004
1996 Ford F-150 Eddie Bauer 4.9L MIL Lamp on VIN: 1FTEF15Y9T
P0171: Lean bank 1. Hello all. Customer complaint mil on. Codes PO171 and PO174 for lean bank 1 and lean bank 2 stored. Found high idle, used smoke machine to find severe intake manifold vacuum leak. Replaced upper and lower intake manifold gaskets. Found large piece missing from...
May 12, 2004
1999 Subaru Impreza L 2.2L Poor Idle Quality, LACK OF POWER VIN: 1F1GF4856X
P0171: fuel trim malfunction bank 1. Subaru guys help!!! This impreza was brought in with the complaint of would not go over 70mph. Test drive confirmed this right away, the idle quality was very poor. Computer diagnostics showed missfires on all cylinders, oxygen sensor biased lean and would com...
May 13, 2004
1998 Mercedes-Benz ML320 3.2L Poor Idle Quality, Surge, Cuts out, Stall, Misfire VIN: 4JGA54E9WA
P0171: fuel trim malfunction bank 1. hello all this vehicle came in with customer complaining that it stalls. check crank signal when it stalls no crank sinal so replace it has not stall eversince but now lacks power and misfires.
May 19, 2004
1997 Toyota Camry CE 2.2L MIL Lamp on VIN: 4T1BG22K8V
P0171: Fuel System Too Lean (Bank 1). This federal camry runs ok, has a P0171 with MIL on. lt fuel trim is 25% at idle some times its over 40%. When you drive the lt goes to zero and runs around.The front O2 (not af sensor)is running very well with a good range full sweep .100 to .900 . rear o2 ha...
May 19, 2004
1996 Ford Contour GL 2.0L MIL Lamp on VIN: 1FALP653XT
P0171: System Too Lean Bank 1. ... customer brought his 1996 Ford Contour in due to a check engine light coming back on after it was reset a few weeks ago. The code that was extracted was P0171- System Too Lean (Bank 1). After going on a test drive with the customer and my OTC Genisys Scan ...
May 26, 2004
2000 Nissan Maxima GLE 3.0L Hesitation, Cuts out, MIL Lamp on VIN: JN1CA31D0Y
P0171: Fuel Trim Lean (Bank 1). This car idles fine. On acceration it lacks any power and boggs down like it is running out of fuel. The O2s go lean and the engine won't pick up enough speed for the MAF to go any higher than 12 grams. We can introduce propane and the engine picks up power an...
May 26, 2004
2000 Toyota Corolla VE 1.8L Hesitation, Cuts out, Stall VIN: 1NXBR12E1Y
P0171: Fuel System Too Lean (Bank 1). Came in with P0171. Also owner reports for the last two months stumbles very badly cold. Verified that any time it sits a few hours when put it in drive immediately after started it stumbles and lean pops very badly under load. Idles fine. After a minute or so...
May 27, 2004
2000 Lexus RX300 3.0L MIL Lamp on VIN: JT6HF10U1Y
P0171: System lean. HI, This car came in 3 weeks ago with the MIL on. I found a PO171 code. The fuel trim looked okay, so I cleared the code. The light came back on about 1 week later. I can't read upstream O2 voltage. The long and short term fuel trim look okay. They are both ve...
May 28, 2004
2000 Ford Taurus SE 4-Valve 3.0L Stall VIN: 1FAFP56S5Y
P0171: lean bank 1. Hi need help from you ford technicians I have a 2000 ford taurus 3.o liter 24 valve that came in to the shop with the complaint runs rough at idle and stalling with check engine light on checked codes had po171 lean bank 1 and po174 lean bank 2 codes, what thi...
May 29, 2004
1996 Ford Explorer Eddie Bauer 4.0L Excessive Emissions, Poor Idle Quality, Surge, Stall VIN: 1FMCU34X3T
P0171: Bank 1 System too lean. Hello All, I have this Explorer that has me baffled. When it came in the shop I had several codes but found a main vacuum hose off so erased codes and only one has returned since and that was a PO171. However, that code did not return for several days in which...
May 31, 2004
1997 Ford F-150 Lariat 4.6L MIL Lamp on VIN: 1FTDX18W8V
P0171: right bank fuel system lean. Hello we have a ford f-150 that has both banks coming up with lean codes.The maf has been replaced,both upstream o2 sensors,the fuel trims are in the normal range at cruise speeds,but at idle the trims go to the - limit and read error. We have checked visably ...
May 05, 2004
2000 Dodge Durango 4.7L Excessive Emissions, Poor Fuel Economy, MIL Lamp on VIN: 1B4HS28N0Y
P0171: Fuel System Lean (Bank 1). O2 sensor full of black soot, non responsive, for the second time in 500 miles. Running full rich. Appears to be seeping oil out of the top of the sensor. Do the 4.7 motors have a problem fouling the O2 sensor? There are no vacuum leaks that we can find.
May 06, 2004
1996 Ford F-150 Special 5.0L Poor Fuel Economy, MIL Lamp on VIN: 1FTF15M5TL
P0171: bank one lean. ... where all repairs were made new o2 sensors pcm cts fuel filter injectors cleaned plugs wires cap rotor, problem still occurs. when first driving truck o2 sensors stfuel lt fuel all appear normal after about 6 miles code p1000 will erace and codes will rese...
May 07, 2004
1997 Ford Explorer Eddie Bauer 4.0L Misfire VIN: 1FMDU32E8V
P0171: sys too lean bank 1. I am having a difficult time diagnosing this vehicle. I know I have one bad injector. Cylinder 2 and 6 misfire at an idle, and clean up with higher rpm. B2s1 will intermittenly stay lean. while the rear responds correctly. I also used the vantage to check the ...
May 10, 2004
2000 Dodge Neon ES 2.0L Misfire, MIL Lamp on VIN: 1B3ES46CXY
P0171: Fuel System Lean (Bank 1). hi. It goes like this. damsel in distress stating that her car started bucking/jerking losing power but healed itself enough to get to the shop. a quick scan test revealed a history code 39 starts ago [po340].running fine at this time.while monitoring scan dat...
May 11, 2004
1997 Ford Explorer Eddie Bauer 4.0L Misfire VIN: 1FMDU32E8V
P0171: sys too lean bank 1. I am having a difficult time diagnosing this vehicle. I know I have one bad injector. Cylinder 2 and 6 misfire at an idle, and clean up with higher rpm. B2s1 will intermittenly stay lean. while the rear responds correctly. I also used the vantage to check the ...
May 11, 2004
1996 Ford F-150 Eddie Bauer 4.9L MIL Lamp on VIN: 1FTEF15Y9T
P0171: Lean bank 1. Hello all. Customer complaint mil on. Codes PO171 and PO174 for lean bank 1 and lean bank 2 stored. Found high idle, used smoke machine to find severe intake manifold vacuum leak. Replaced upper and lower intake manifold gaskets. Found large piece missing from...
May 12, 2004
1999 Subaru Impreza L 2.2L Poor Idle Quality, LACK OF POWER VIN: 1F1GF4856X
P0171: fuel trim malfunction bank 1. Subaru guys help!!! This impreza was brought in with the complaint of would not go over 70mph. Test drive confirmed this right away, the idle quality was very poor. Computer diagnostics showed missfires on all cylinders, oxygen sensor biased lean and would com...
May 13, 2004
1998 Mercedes-Benz ML320 3.2L Poor Idle Quality, Surge, Cuts out, Stall, Misfire VIN: 4JGA54E9WA
P0171: fuel trim malfunction bank 1. hello all this vehicle came in with customer complaining that it stalls. check crank signal when it stalls no crank sinal so replace it has not stall eversince but now lacks power and misfires.
May 19, 2004
1997 Toyota Camry CE 2.2L MIL Lamp on VIN: 4T1BG22K8V
P0171: Fuel System Too Lean (Bank 1). This federal camry runs ok, has a P0171 with MIL on. lt fuel trim is 25% at idle some times its over 40%. When you drive the lt goes to zero and runs around.The front O2 (not af sensor)is running very well with a good range full sweep .100 to .900 . rear o2 ha...
May 19, 2004
1996 Ford Contour GL 2.0L MIL Lamp on VIN: 1FALP653XT
P0171: System Too Lean Bank 1. ... customer brought his 1996 Ford Contour in due to a check engine light coming back on after it was reset a few weeks ago. The code that was extracted was P0171- System Too Lean (Bank 1). After going on a test drive with the customer and my OTC Genisys Scan ...
May 26, 2004
2000 Nissan Maxima GLE 3.0L Hesitation, Cuts out, MIL Lamp on VIN: JN1CA31D0Y
P0171: Fuel Trim Lean (Bank 1). This car idles fine. On acceration it lacks any power and boggs down like it is running out of fuel. The O2s go lean and the engine won't pick up enough speed for the MAF to go any higher than 12 grams. We can introduce propane and the engine picks up power an...
May 26, 2004
2000 Toyota Corolla VE 1.8L Hesitation, Cuts out, Stall VIN: 1NXBR12E1Y
P0171: Fuel System Too Lean (Bank 1). Came in with P0171. Also owner reports for the last two months stumbles very badly cold. Verified that any time it sits a few hours when put it in drive immediately after started it stumbles and lean pops very badly under load. Idles fine. After a minute or so...
May 27, 2004
2000 Lexus RX300 3.0L MIL Lamp on VIN: JT6HF10U1Y
P0171: System lean. HI, This car came in 3 weeks ago with the MIL on. I found a PO171 code. The fuel trim looked okay, so I cleared the code. The light came back on about 1 week later. I can't read upstream O2 voltage. The long and short term fuel trim look okay. They are both ve...
May 28, 2004
2000 Ford Taurus SE 4-Valve 3.0L Stall VIN: 1FAFP56S5Y
P0171: lean bank 1. Hi need help from you ford technicians I have a 2000 ford taurus 3.o liter 24 valve that came in to the shop with the complaint runs rough at idle and stalling with check engine light on checked codes had po171 lean bank 1 and po174 lean bank 2 codes, what thi...
May 29, 2004
1996 Ford Explorer Eddie Bauer 4.0L Excessive Emissions, Poor Idle Quality, Surge, Stall VIN: 1FMCU34X3T
P0171: Bank 1 System too lean. Hello All, I have this Explorer that has me baffled. When it came in the shop I had several codes but found a main vacuum hose off so erased codes and only one has returned since and that was a PO171. However, that code did not return for several days in which...
May 31, 2004