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P0171 Diagnostic Trouble Code Discussion for August 2009

Fuel System Lean (Bank 1)


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Trouble Ticket Help Requests for DTC P0171
Help Request Posted
2004 Chevrolet Express 3500 6.0L Poor Idle Quality, MIL Lamp on VIN: 1GBHG31V64
P0171: Fuel Trim System Lean (Bank 1). when this truck was brought to us 3 months ago mil light on with a p0157 low b2s2 activity and oe plugs at 85000, we thought it to be a no brainer ,full tune up and 4 new 02 sensors.flash ahead 2 months and we r chasing multiple o2 and lean exhaust codes.repla...
August 04, 2009
1999 Ford F-250 Lariat 5.4L Poor Idle Quality, MIL Lamp on VIN: 2FTPX28L8X
P0171: lean bank 1. customer brought in the truck with a rough idle, po171 code. checked pcv system hoses, no holes in the rubber elbows. unable to find any vacuum leaks. installed new plugs in #1 bank. replaced to coil boots, due to cracking. injectors check good. fuel pressure ...
August 06, 2009
2006 Chevrolet Colorado LT 2.8L MIL Lamp on VIN: 1GCCS19866
P0171: Fuel System Lean (Bank 1). low block cell, balanced o2 readings, very high long term fuel trim of 24%, freeze frame data 23 failures in the last 93 miles. all at idle and to oper temp.
August 07, 2009
2004 Dodge Stratus ES 2.7L Surge, MIL Lamp on VIN: 1B3EL36T44
P0171: Fuel System Lean (Bank 1). This is a government car and is running E85. Vehicle repeatedly sets 171/174 codes, surges at rpm's above 1200 and has a major surge/hickup at approx. 3800rpm. Freeze frame data shows that the vehicle is not sensing any % of ethanol (we have tested and verifie...
August 07, 2009
1996 Ford F-150 Special 4.9L MIL Lamp on VIN: 1FTEF15Y5T
P0171: lean bank 1. truck came in with 2 dtc checked data on the motice & all 3 o2 sensors are working ok they are switching rich/lean continuousy replaced fuel filter & checked for vacuum leaks found none. checked fuel injectors for operation & leak down found no pro...
August 11, 2009
2002 Jaguar S-Type 3.0L MIL Lamp on VIN: SAJDA01N42
P0171: system lean bank 1. We have pulled our hair out on this jag, we found a tsb on the intake lower and upper gaskets, it states that these like to leak and cause a dieing and a mil light for a lean problem. We are using jag parts only and we installed all gaskets and also a Maf sens...
August 11, 2009
2000 Nissan Altima SE 2.4L Poor Idle Quality, Stall VIN: 1N4DL01A3Y
P0171: Fuel Trim Lean (Bank 1). Vehicle came in with check engine light on and stalls at idle. Had code for MAF. Replaced MAF and performed BG induction service. Test drove vehicle with no problems. Customer picked up vehicle and returned within 15 minutes stating that the vehicle had a roug...
August 13, 2009
1996 Ford F-150 Special 4.9L MIL Lamp on VIN: 1FTEF15Y5T
P0171: lean bank 1. truck came in with 2 dtc checked data on the motice & all 3 o2 sensors are working ok they are switching rich/lean continuousy replaced fuel filter & checked for vacuum leaks found none. checked fuel injectors for operation & leak down found no pro...
August 14, 2009
2000 Nissan Altima SE 2.4L Poor Idle Quality, Stall VIN: 1N4DL01A3Y
P0171: Fuel Trim Lean (Bank 1). Vehicle came in with check engine light on and stalls at idle. Had code for MAF. Replaced MAF and performed BG induction service. Test drove vehicle with no problems. Customer picked up vehicle and returned within 15 minutes stating that the vehicle had a roug...
August 14, 2009
2004 Ford F-250 Super Duty XL 6.8L MIL Lamp on VIN: 1FTEW25SJ4
P0171: FUEL SYSTEM Lean bank 1. Customer states: bucks, runs bad under load when damp/wet outside. also poor MPG Yes I know it's a V-10 I am using Snap-ON Verus scanner for testing/inspecting this veh. Traded my MODIS for it a couple weeks ago so still getting used to seeing so much data at...
August 15, 2009
2004 Ford F-250 Super Duty XL 6.8L MIL Lamp on VIN: 1FTEW25SJ4
P0171: FUEL SYSTEM Lean bank 1. Customer states: bucks, runs bad under load when damp/wet outside. also poor MPG Yes I know it's a V-10 I am using Snap-ON Verus scanner for testing/inspecting this veh. Traded my MODIS for it a couple weeks ago so still getting used to seeing so much data at...
August 17, 2009
2004 BMW X3 3.0i 3.0L Poor Idle Quality, MIL Lamp on VIN: WBXPA934X4
P0171: mixture preparation bank 1. This car has been back 3 times while we try and sort this mess out. The first two times it only had the O2 sensor codes. We replaced the sensors and recommended going to BMW for the software update. For some readson the changed the VTG oil and didnt do an upda...
August 18, 2009
2005 Hyundai Elantra GLS 2.0L MIL Lamp on VIN: KMHDN46D95
P0171: Fuel System Too Lean (Bank 1). have this vehicle light came on about 3 months ago for same codes someone cleared them and shipped car now im working on it now i have substituded known good o2 sensors and mass air flow sensors and im at a loss no vac. leaks or intake leaks exhaust system is ...
August 18, 2009
2001 Nissan Sentra SE 2.0L Hesitation, Surge VIN: 3N1BB51D91
P0171: Fuel Trim Lean. CAR HAS HESITATION/SURGE BETWEEN 1500RPM AND 2000RPM ENGINE RUNS GREAT FROM 2000RPM TO 5000RPM, AT IDLE ST FT -25% 02 .920V... INJECTOR PW 2.36 ms AT 1600RPM ST FT +25% 02 0.000V injector PW 6.50ms at 2500rpm engine is runing good and fuel trims + - 5% and inj...
August 21, 2009
2000 Ford Taurus SE 4-Valve 3.0L MIL Lamp on VIN: 1FAFP555S5
P0171: bank one lean. ... same codes, P0171 and a P0174, both banks lean. any help will be apreciated.
August 25, 2009
2002 Jaguar S-Type 3.0L MIL Lamp on VIN: SAJDA01N42
P0171: system lean bank 1. We have pulled our hair out on this jag, we found a tsb on the intake lower and upper gaskets, it states that these like to leak and cause a dieing and a mil light for a lean problem. We are using jag parts only and we installed all gaskets and also a Maf sens...
August 25, 2009
2007 GMC Acadia SLT 3.6L MIL Lamp on, traction control off VIN: 1GKER3357J
P0171: Fuel System Lean (Bank 1). Hello Techs, Thanks for reading. We have this vehicle in the shop for a second time in two weeks. Originally we repaired a P0442 dtc for evao emmisions small leak. This involved removing the fuel tank and replaceing the evap vent solenoid. We returned the vehi...
August 27, 2009
2007 GMC Acadia SLT 3.6L MIL Lamp on, traction control off VIN: 1GKER3357J
P0171: Fuel System Lean (Bank 1). Hello Techs, Thanks for reading. We have this vehicle in the shop for a second time in two weeks. Originally we repaired a P0442 dtc for evao emmisions small leak. This involved removing the fuel tank and replaceing the evap vent solenoid. We returned the vehi...
August 28, 2009
2004 Chevrolet Express 3500 6.0L Poor Idle Quality, MIL Lamp on VIN: 1GBHG31V64
P0171: Fuel Trim System Lean (Bank 1). when this truck was brought to us 3 months ago mil light on with a p0157 low b2s2 activity and oe plugs at 85000, we thought it to be a no brainer ,full tune up and 4 new 02 sensors.flash ahead 2 months and we r chasing multiple o2 and lean exhaust codes.repla...
August 04, 2009
1999 Ford F-250 Lariat 5.4L Poor Idle Quality, MIL Lamp on VIN: 2FTPX28L8X
P0171: lean bank 1. customer brought in the truck with a rough idle, po171 code. checked pcv system hoses, no holes in the rubber elbows. unable to find any vacuum leaks. installed new plugs in #1 bank. replaced to coil boots, due to cracking. injectors check good. fuel pressure ...
August 06, 2009
2006 Chevrolet Colorado LT 2.8L MIL Lamp on VIN: 1GCCS19866
P0171: Fuel System Lean (Bank 1). low block cell, balanced o2 readings, very high long term fuel trim of 24%, freeze frame data 23 failures in the last 93 miles. all at idle and to oper temp.
August 07, 2009
2004 Dodge Stratus ES 2.7L Surge, MIL Lamp on VIN: 1B3EL36T44
P0171: Fuel System Lean (Bank 1). This is a government car and is running E85. Vehicle repeatedly sets 171/174 codes, surges at rpm's above 1200 and has a major surge/hickup at approx. 3800rpm. Freeze frame data shows that the vehicle is not sensing any % of ethanol (we have tested and verifie...
August 07, 2009
1996 Ford F-150 Special 4.9L MIL Lamp on VIN: 1FTEF15Y5T
P0171: lean bank 1. truck came in with 2 dtc checked data on the motice & all 3 o2 sensors are working ok they are switching rich/lean continuousy replaced fuel filter & checked for vacuum leaks found none. checked fuel injectors for operation & leak down found no pro...
August 11, 2009
2002 Jaguar S-Type 3.0L MIL Lamp on VIN: SAJDA01N42
P0171: system lean bank 1. We have pulled our hair out on this jag, we found a tsb on the intake lower and upper gaskets, it states that these like to leak and cause a dieing and a mil light for a lean problem. We are using jag parts only and we installed all gaskets and also a Maf sens...
August 11, 2009
2000 Nissan Altima SE 2.4L Poor Idle Quality, Stall VIN: 1N4DL01A3Y
P0171: Fuel Trim Lean (Bank 1). Vehicle came in with check engine light on and stalls at idle. Had code for MAF. Replaced MAF and performed BG induction service. Test drove vehicle with no problems. Customer picked up vehicle and returned within 15 minutes stating that the vehicle had a roug...
August 13, 2009
1996 Ford F-150 Special 4.9L MIL Lamp on VIN: 1FTEF15Y5T
P0171: lean bank 1. truck came in with 2 dtc checked data on the motice & all 3 o2 sensors are working ok they are switching rich/lean continuousy replaced fuel filter & checked for vacuum leaks found none. checked fuel injectors for operation & leak down found no pro...
August 14, 2009
2000 Nissan Altima SE 2.4L Poor Idle Quality, Stall VIN: 1N4DL01A3Y
P0171: Fuel Trim Lean (Bank 1). Vehicle came in with check engine light on and stalls at idle. Had code for MAF. Replaced MAF and performed BG induction service. Test drove vehicle with no problems. Customer picked up vehicle and returned within 15 minutes stating that the vehicle had a roug...
August 14, 2009
2004 Ford F-250 Super Duty XL 6.8L MIL Lamp on VIN: 1FTEW25SJ4
P0171: FUEL SYSTEM Lean bank 1. Customer states: bucks, runs bad under load when damp/wet outside. also poor MPG Yes I know it's a V-10 I am using Snap-ON Verus scanner for testing/inspecting this veh. Traded my MODIS for it a couple weeks ago so still getting used to seeing so much data at...
August 15, 2009
2004 Ford F-250 Super Duty XL 6.8L MIL Lamp on VIN: 1FTEW25SJ4
P0171: FUEL SYSTEM Lean bank 1. Customer states: bucks, runs bad under load when damp/wet outside. also poor MPG Yes I know it's a V-10 I am using Snap-ON Verus scanner for testing/inspecting this veh. Traded my MODIS for it a couple weeks ago so still getting used to seeing so much data at...
August 17, 2009
2004 BMW X3 3.0i 3.0L Poor Idle Quality, MIL Lamp on VIN: WBXPA934X4
P0171: mixture preparation bank 1. This car has been back 3 times while we try and sort this mess out. The first two times it only had the O2 sensor codes. We replaced the sensors and recommended going to BMW for the software update. For some readson the changed the VTG oil and didnt do an upda...
August 18, 2009
2005 Hyundai Elantra GLS 2.0L MIL Lamp on VIN: KMHDN46D95
P0171: Fuel System Too Lean (Bank 1). have this vehicle light came on about 3 months ago for same codes someone cleared them and shipped car now im working on it now i have substituded known good o2 sensors and mass air flow sensors and im at a loss no vac. leaks or intake leaks exhaust system is ...
August 18, 2009
2001 Nissan Sentra SE 2.0L Hesitation, Surge VIN: 3N1BB51D91
P0171: Fuel Trim Lean. CAR HAS HESITATION/SURGE BETWEEN 1500RPM AND 2000RPM ENGINE RUNS GREAT FROM 2000RPM TO 5000RPM, AT IDLE ST FT -25% 02 .920V... INJECTOR PW 2.36 ms AT 1600RPM ST FT +25% 02 0.000V injector PW 6.50ms at 2500rpm engine is runing good and fuel trims + - 5% and inj...
August 21, 2009
2000 Ford Taurus SE 4-Valve 3.0L MIL Lamp on VIN: 1FAFP555S5
P0171: bank one lean. ... same codes, P0171 and a P0174, both banks lean. any help will be apreciated.
August 25, 2009
2002 Jaguar S-Type 3.0L MIL Lamp on VIN: SAJDA01N42
P0171: system lean bank 1. We have pulled our hair out on this jag, we found a tsb on the intake lower and upper gaskets, it states that these like to leak and cause a dieing and a mil light for a lean problem. We are using jag parts only and we installed all gaskets and also a Maf sens...
August 25, 2009
2007 GMC Acadia SLT 3.6L MIL Lamp on, traction control off VIN: 1GKER3357J
P0171: Fuel System Lean (Bank 1). Hello Techs, Thanks for reading. We have this vehicle in the shop for a second time in two weeks. Originally we repaired a P0442 dtc for evao emmisions small leak. This involved removing the fuel tank and replaceing the evap vent solenoid. We returned the vehi...
August 27, 2009
2007 GMC Acadia SLT 3.6L MIL Lamp on, traction control off VIN: 1GKER3357J
P0171: Fuel System Lean (Bank 1). Hello Techs, Thanks for reading. We have this vehicle in the shop for a second time in two weeks. Originally we repaired a P0442 dtc for evao emmisions small leak. This involved removing the fuel tank and replaceing the evap vent solenoid. We returned the vehi...
August 28, 2009