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P0171 Diagnostic Trouble Code Discussion for April 2006

Fuel System Lean (Bank 1)


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Trouble Ticket Help Requests for DTC P0171
Help Request Posted
2001 Nissan Sentra GXE 1.8L Poor Idle Quality, MIL Lamp on VIN: 3N1CB51D71
P0171: Fuel Trim Lean. Customer failed emissions because of service engine light.Cuctomer changed O2 sensors both banks.Customer changed fuel pump & spark plugs.Now O2s both show very lean..02 volts.Enrich with with propane they go .850 to.900 volts. Mass airflow voltage tests.9...
April 03, 2006
2001 GMC Sierra 1500 SL 4.8L MIL Lamp on VIN: 1GTEC14V81
P0171: Fuel Trim System Lean (Bank 1). vehicle came in with mil light on. found po171 and po174 codes. changed fuel filter and pressure tested system. fuel filter plugged. checked for vacume leaks, non found. local dealer informed us on intake gasket leak. replaced gasket and still have same 2 code...
April 04, 2006
2001 Mazda MPV DX 2.5L MIL Lamp on VIN: JM3LW28G11
P0171: Adaptive Fuel Trim Too Lean (Bank 1). ... intermittently throw a check engine light. Codes P0171 and P0174 are stored in memory (bank 1 system lean, and bank 2 system lean). We have replaced the intake plenum gaskets per Mazda service bulletin for these codes (we used Fel-pro gaskets rather than g...
April 05, 2006
2001 Toyota Corolla CE 1.8L mil on no complaints VIN: 2T1BR12E71
P0171: Fuel System Too Lean (Bank 1). intermittantly (approx. every 2 weeks)the mil comes on with dtc po171.customer has no performance complaints.here is some of the freeze data:cal load 39%,rpm 3347,cool temp 188.6 f,intake air 68.0 f,ctp sw off,s fuel trim 4.6%,l fuel trim 27.3%,fuel sys cl,eng...
April 05, 2006
1997 Toyota Camry CE 2.2L mil on no complaints VIN: 4T1BG22K2V
P0171: Fuel System Too Lean (Bank 1). ... happened for the second time in three months (3764 miles has gone by since last time)this car has 2 dtc's po171 system too lean (fuel trim) and p1210 sub injector cuircuit malfunction.i can't seem to find the p1210 dtc listed in the toyota service manual.t...
April 06, 2006
2002 Chevrolet Blazer LS 4.3L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1GNCT18W72
P0171: Fuel System Lean (Bank 1). Blazer came in with check engine light was off and customer stated light comes on at times and sometimes it idle funny.Test drove blazer and is running okay.Checked codes and got po131,po171,po300.Check freeze frame and got freeze frame for po171.The fuel trim...
April 10, 2006
1996 Lincoln Continental Anniversary 4.6L MIL Lamp on VIN: 1LNCLM97V5
P0171: system lean bank 1. hello ford friends, this vehicle is showing lean fuel condition. LT. fuel trim is 23% bank 1 24% bank 2. checked for vacuum leaks, pcv hoses, air boot intake etc. no troubles found, engine runs very good, no rough idle, no pinging, no hesitation on accel etc. ...
April 18, 2006
1999 Ford Windstar SE 3.8L MIL Lamp on VIN: 2FMZA5240B
P0171: system lean bank one. ... code P0171. When it first happened we found, several posts with a problem with the MAF and reflash the Computer. After checking the basics, Fuel Pressure (38psi KOEO 31 psi KOER), Vacuum (21 in @ Idle) and Smoked for leaks we installed a new MAF (Ford) and...
April 19, 2006
1999 Toyota Camry LE 3.0L Misfire, MIL Lamp on, Chuggle, Black smoke VIN: JT2BF22K3X
P0171: Fuel System Too Lean (Bank 1). ... some minor body damage repaired (grill hood and left front fender replaced) The core support did shift back and dent the front exaust manifold heat shield and slightly bend the front mixture control sensor as I found out when I replaced it thinking it prob...
April 20, 2006
1995 Ford Windstar GL 3.8L MIL Lamp on, Low power VIN: 2FMDA5141S
This car has the MIL light on with all of the codes listed above. We cleared the codes and within 1 hour of driving the light was back on with codes 1131 and 1151 indicating a lean condition in both banks. We double checked fuel pressure and smoke tested the i...
April 21, 2006
1995 Ford Windstar GL 3.8L MIL Lamp on, Low power VIN: 2FMDA5141S
This car has the MIL light on with all of the codes listed above. We cleared the codes and within 1 hour of driving the light was back on with codes 1131 and 1151 indicating a lean condition in both banks. We double checked fuel pressure and smoke tested the i...
April 24, 2006
2004 Ford F-150 FX4 5.4L Hesitation, Surge, Cuts out, Misfire, MIL Lamp on VIN: 1FTPW14554
P0171: lean bank 1. Customer complains of truck losing power, surging, ses lite, and with pedal to the floor will not accelerate. had to limp it back to town. We just did a full tune up and injector clean, fuel filter etc, on this truck last week. i took this truck out for an hou...
April 24, 2006
1999 Ford Ranger XL 3.0L Poor Idle Quality VIN: 1FTYR14V7X
P0171: lean bank 1 hard code. ... driving. found code p0171 lean bank 1 (hard) and p0172 lean bank 2 (pending). codes return after a few weeks. 02 sensor waveforms look ok (bank 1 looks a little slower). MAF waveform looks good. Plugs and wires are good. Found...
April 25, 2006
2001 Volkswagen Passat GLS 1.8L MIL Lamp on VIN: WVWPD23B51
P0171: 17544. ... codes ( 18062 plus evap code and 17544 ) which I fixed with a new purge valve solenoid , inst cluster temp sensor , the low price dual output coolant sensor on the engine fixed the problem, it also had code P 0171 or P 1136 or 17544 bank one mixture adapta...
April 27, 2006
2001 Ford Expedition Eddie Bauer 5.4L MIL Lamp on VIN: 1FMPU18L51
This vehicle is really becoming a headache. Vehicle sets both codes po171 and p0174 within 3-4 days of being cleared. I have already replaced maf and pcv valve and hose service kit. Maf was reading low and pcv hose was leaking. I have disconnected batt for ove...
April 28, 2006
1998 Mazda 626 DX 2.0L MIL Lamp on VIN: 1YVGF22C3W
P0171: Adaptive Fuel Trim Too Lean (Bank 1). short term fuel trim shoots up to limit at idle every time. passes all test from alldata for code 0171. no vac leaks by smoke machine. as soon as you leave idle, short term drops right to 0 or threre about. vehicle runs great. no drivability problems at all. s...
April 28, 2006
2001 Nissan Sentra GXE 1.8L Poor Idle Quality, MIL Lamp on VIN: 3N1CB51D71
P0171: Fuel Trim Lean. Customer failed emissions because of service engine light.Cuctomer changed O2 sensors both banks.Customer changed fuel pump & spark plugs.Now O2s both show very lean..02 volts.Enrich with with propane they go .850 to.900 volts. Mass airflow voltage tests.9...
April 03, 2006
2001 GMC Sierra 1500 SL 4.8L MIL Lamp on VIN: 1GTEC14V81
P0171: Fuel Trim System Lean (Bank 1). vehicle came in with mil light on. found po171 and po174 codes. changed fuel filter and pressure tested system. fuel filter plugged. checked for vacume leaks, non found. local dealer informed us on intake gasket leak. replaced gasket and still have same 2 code...
April 04, 2006
2001 Mazda MPV DX 2.5L MIL Lamp on VIN: JM3LW28G11
P0171: Adaptive Fuel Trim Too Lean (Bank 1). ... intermittently throw a check engine light. Codes P0171 and P0174 are stored in memory (bank 1 system lean, and bank 2 system lean). We have replaced the intake plenum gaskets per Mazda service bulletin for these codes (we used Fel-pro gaskets rather than g...
April 05, 2006
2001 Toyota Corolla CE 1.8L mil on no complaints VIN: 2T1BR12E71
P0171: Fuel System Too Lean (Bank 1). intermittantly (approx. every 2 weeks)the mil comes on with dtc po171.customer has no performance complaints.here is some of the freeze data:cal load 39%,rpm 3347,cool temp 188.6 f,intake air 68.0 f,ctp sw off,s fuel trim 4.6%,l fuel trim 27.3%,fuel sys cl,eng...
April 05, 2006
1997 Toyota Camry CE 2.2L mil on no complaints VIN: 4T1BG22K2V
P0171: Fuel System Too Lean (Bank 1). ... happened for the second time in three months (3764 miles has gone by since last time)this car has 2 dtc's po171 system too lean (fuel trim) and p1210 sub injector cuircuit malfunction.i can't seem to find the p1210 dtc listed in the toyota service manual.t...
April 06, 2006
2002 Chevrolet Blazer LS 4.3L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1GNCT18W72
P0171: Fuel System Lean (Bank 1). Blazer came in with check engine light was off and customer stated light comes on at times and sometimes it idle funny.Test drove blazer and is running okay.Checked codes and got po131,po171,po300.Check freeze frame and got freeze frame for po171.The fuel trim...
April 10, 2006
1996 Lincoln Continental Anniversary 4.6L MIL Lamp on VIN: 1LNCLM97V5
P0171: system lean bank 1. hello ford friends, this vehicle is showing lean fuel condition. LT. fuel trim is 23% bank 1 24% bank 2. checked for vacuum leaks, pcv hoses, air boot intake etc. no troubles found, engine runs very good, no rough idle, no pinging, no hesitation on accel etc. ...
April 18, 2006
1999 Ford Windstar SE 3.8L MIL Lamp on VIN: 2FMZA5240B
P0171: system lean bank one. ... code P0171. When it first happened we found, several posts with a problem with the MAF and reflash the Computer. After checking the basics, Fuel Pressure (38psi KOEO 31 psi KOER), Vacuum (21 in @ Idle) and Smoked for leaks we installed a new MAF (Ford) and...
April 19, 2006
1999 Toyota Camry LE 3.0L Misfire, MIL Lamp on, Chuggle, Black smoke VIN: JT2BF22K3X
P0171: Fuel System Too Lean (Bank 1). ... some minor body damage repaired (grill hood and left front fender replaced) The core support did shift back and dent the front exaust manifold heat shield and slightly bend the front mixture control sensor as I found out when I replaced it thinking it prob...
April 20, 2006
1995 Ford Windstar GL 3.8L MIL Lamp on, Low power VIN: 2FMDA5141S
This car has the MIL light on with all of the codes listed above. We cleared the codes and within 1 hour of driving the light was back on with codes 1131 and 1151 indicating a lean condition in both banks. We double checked fuel pressure and smoke tested the i...
April 21, 2006
1995 Ford Windstar GL 3.8L MIL Lamp on, Low power VIN: 2FMDA5141S
This car has the MIL light on with all of the codes listed above. We cleared the codes and within 1 hour of driving the light was back on with codes 1131 and 1151 indicating a lean condition in both banks. We double checked fuel pressure and smoke tested the i...
April 24, 2006
2004 Ford F-150 FX4 5.4L Hesitation, Surge, Cuts out, Misfire, MIL Lamp on VIN: 1FTPW14554
P0171: lean bank 1. Customer complains of truck losing power, surging, ses lite, and with pedal to the floor will not accelerate. had to limp it back to town. We just did a full tune up and injector clean, fuel filter etc, on this truck last week. i took this truck out for an hou...
April 24, 2006
1999 Ford Ranger XL 3.0L Poor Idle Quality VIN: 1FTYR14V7X
P0171: lean bank 1 hard code. ... driving. found code p0171 lean bank 1 (hard) and p0172 lean bank 2 (pending). codes return after a few weeks. 02 sensor waveforms look ok (bank 1 looks a little slower). MAF waveform looks good. Plugs and wires are good. Found...
April 25, 2006
2001 Volkswagen Passat GLS 1.8L MIL Lamp on VIN: WVWPD23B51
P0171: 17544. ... codes ( 18062 plus evap code and 17544 ) which I fixed with a new purge valve solenoid , inst cluster temp sensor , the low price dual output coolant sensor on the engine fixed the problem, it also had code P 0171 or P 1136 or 17544 bank one mixture adapta...
April 27, 2006
2001 Ford Expedition Eddie Bauer 5.4L MIL Lamp on VIN: 1FMPU18L51
This vehicle is really becoming a headache. Vehicle sets both codes po171 and p0174 within 3-4 days of being cleared. I have already replaced maf and pcv valve and hose service kit. Maf was reading low and pcv hose was leaking. I have disconnected batt for ove...
April 28, 2006
1998 Mazda 626 DX 2.0L MIL Lamp on VIN: 1YVGF22C3W
P0171: Adaptive Fuel Trim Too Lean (Bank 1). short term fuel trim shoots up to limit at idle every time. passes all test from alldata for code 0171. no vac leaks by smoke machine. as soon as you leave idle, short term drops right to 0 or threre about. vehicle runs great. no drivability problems at all. s...
April 28, 2006