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P0171 Diagnostic Trouble Code Discussion for February 2006

Fuel System Lean (Bank 1)


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Trouble Ticket Help Requests for DTC P0171
Help Request Posted
2003 Chevrolet Trailblazer LS 4.2L MIL Lamp on VIN: 1GNET165X3
P0171: Fuel System Lean (Bank 1). ... PO171 System Lean code at idle. Long term fuel trim at 22 Short trim fluctuating near 0. Fuel pressure good at 54 PSI, no vacuum leaks found, sensor data looks good, oxygen sensor switching very good. Also had a U1000 - class 2 serial data code stored, whi...
February 01, 2006
2002 Ford F-150 XL 4.2L MIL Lamp on VIN: 3FTRF17212
P0171: System lean bank 1. MIL light comes on right after going into closed loop with engine temp at about 168F. Long Term Fuel trim was at +24 and Short Term TRim was at +10 on both banks. Problem appears to go away when engine warms up completely (Fuel trim gradually comes down until ...
February 01, 2006
2001 Kia Sportage 2.0L MIL Lamp on
P0171: Fuel System Too Lean (Bank 1). this vehicle cazme in with a broken timing belt. We pulled the head for repairs and replaced the belt and the car was back in two days with the mil on and the code. I found that the O2 sensor had been damamged when the head was off so I replaced it and watched...
February 02, 2006
2000 Infiniti I30 3.0L MIL Lamp on VIN: JNKCA31AXY
P0171: Fuel Trim Lean (Bank 1). Hello and thanks, Car keeps setting a lean code on the rear bank and I cannot find vacuum leak or see the problem in the O2s. I replaced the upstream sensor upon seeing that it acted sluggish until rpms reached 2000 or so then it would become more normal so in...
February 06, 2006
2000 Chrysler 300M 3.5L MIL Lamp on VIN: 2C3HE66GXY
P0171: Fuel System Lean (Bank 1). This car came in with codes po174 and po171. Long term fuel trim at +24.8 on both banks. We smoked it and saw a very small amount of smoke coming from the rear of the lower intake. Replaced throttle body gasket, and upper and lower intake gaskets. Same codes c...
February 07, 2006
1997 Ford Explorer XL 4.0L Poor Idle Quality, Stall, MIL Lamp on
P0171: lean bank 1. ... these and allready did them. No change at all. has the famous lean codes P0171 and P0174, along with misfire codes. long term fuel trim on bank 2 is 25 long term on bank 1 is -5 its got to be injectors, that's what I am think...
February 07, 2006
2000 Ford Contour SE 2.0L MIL Lamp on VIN: 1FAFP6638Y
P0171: system too lean. This vehicle was brought to me from another shop which related the repair history. I have checked the car for vacuum leaks and smoked it to no avail. Any help would be appreciated. Disconnecting the MAF makes no difference to fuel trim. Thanks
February 10, 2006
1998 Toyota RAV4 2.0L Excessive Emissions, Poor Idle Quality, Stall, MIL Lamp on VIN: JT2SK12E5R
P0171: Fuel System Too Lean (Bank 1). hello fellow tech, I'm helping my co- tech,he change O2 on his duagther's 98 RAV4 2.0l due to lean code.He is working on it for a week and he ask my help.when I start cold it seems to run good then gradually run rough and black smokes out on the tailpipe.when ...
February 10, 2006
2003 Land Rover Discovery SE 4.6L MIL Lamp on VIN: SALTY16413
P0171: system too lean bank 1. This Land Rover is a new client who just moved here. A previous shop replaced the MAF and left oxygen sensor very recently for what she describes as the same symptom. The engine idles rough. We read codes and checked for vacuum leaks and didn't find any. We w...
February 13, 2006
1997 Ford E-250 Econoline XL 5.4L MIL Lamp on VIN: 1FTHE24L2V
P0171: system too LEAN BANK 1. ... ENGINE LIGHT WAS ON. WE CHECKED THE TROUBLE CODE AND IT WAS P0171 AND PO174. I TESTED THE CAR OUT, AND IT WAS RUNNING WELL. WE REPLACED THE SPARK PLUGS AND TWO 02 SENSOR. tHE WE GAVE THE CAR BACK TO THE CUSTOMER. AFTER TWO WEEKS THE CUSTOMER BRANG THE CAR ...
February 14, 2006
2001 Land Rover Discovery Series II SD 4.0L MIL Lamp on VIN: SALTL154X1
P0171: Mixture adaptation factorfra bank 1. ... check engine light on.The codes P0171&174 are air flow meter related the code that I am having trouble with is P1481 DMTL heater power stage signal missing.I think the DMTL heater is part of the evap system but I can't ...
February 14, 2006
2000 Toyota Corolla VE 1.8L MIL Lamp on VIN: 2T1BR12E8Y
P0171: Fuel System Too Lean (Bank 1). this car was referred to me from another shop. before the listed repairs were made the po171 code would set within 5-7 miles of city driving or crusing. the customer put 100 miles on,in city driving 35 -55 mph no codes set .went to get on interstate and light ...
February 15, 2006
2000 Ford Windstar SE 3.8L Stall, MIL Lamp on VIN: 2FMZA5243Y
P0171: too lean bank 1. hello ford techs. this is a tough one,2 months ago same problem occurred.cold stall,had to featherthrottle to keep it running.fuel pressure within specs. replaced both upstream o2 sensors,cleared codes,problem fixed! came back yesterday,same prob.po171-too lea...
February 17, 2006
1997 Ford Ranger Splash 2.3L detination VIN: 1FTCR14A8V
P0171: bank 1 lean. This is a two owner truck that has been detinating since new. It sets a lean code now and then [Po171]. The O2 sensor is capable of reading 1 volt with inrichment and reads greater than .9 volts at WOT when its detinating, the long term fuel trim is around 16 ...
February 21, 2006
2000 Ford Explorer XLT 4.0L Poor Idle Quality, Stall, MIL Lamp on VIN: 1FMZU73E3Y
P0171: lean bank 1. ford guys - need your help. this explorer runs rough cold, stalls - have to keep on accelerator to keep it running. once it warms up all is fine except for check engine light. scanned and found lean codes, bank 1 and 2. being a gm tech my tools for this are li...
February 21, 2006
2000 Infiniti I30 3.0L MIL Lamp on VIN: JNKCA31AXY
P0171: Fuel Trim Lean (Bank 1). Hello and thanks, Car keeps setting a lean code on the rear bank and I cannot find vacuum leak or see the problem in the O2s. I replaced the upstream sensor upon seeing that it acted sluggish until rpms reached 2000 or so then it would become more normal so in...
February 21, 2006
2003 Chevrolet Express 1500 5.3L MIL Lamp on VIN: 1GCFG15T93
P0171: Fuel Trim System Lean (Bank 1). Any GM tech's out there. Help!! This van came in with a mass air flow code and lean fuel trim codes. The truck was running rough and stalling. We replaced the mass air flow sensor and the mass air flow code went away the truck ran much better. The mil light ca...
February 23, 2006
1998 Ford E-350 Econoline Club Wagon XLT 6.8L MIL Lamp on, lean condition VIN: 1FBSS31S3W
P0171: Fuel system lean bank 1. ... on with P0171 & P0174. Vehicle was in desperate need of tune-up. We replaced plugs, filters, cleaned MAF Sensor, and performed fuel injection service. After that we noted that the DPFE sensor was reading at idle and KOEO 1.98 volts. We also noted that ...
February 23, 2006
2005 Ford F-250 Super Duty Lariat 5.4L MIL Lamp on VIN: 1FTSX20555
P0171: system lean bank1. ... HANDLE A FLEET OF 04,05 F-250S ALL WITH HIGH MILEAGE AND 5.4 ENGINES. THEY USUALLY COME IN WITH MIL LIGHTS ON AND ROUGH RUNNING.SCAN THE VEHICLES AND USUALLY P0300 CODES AND P0171&174. FIND THEY ARE IN DIRE NEED OF TUNE-UP AND STOPPED UP FUEL FILTER. C...
February 27, 2006
2001 Nissan Maxima GLE 3.0L MIL Lamp on VIN: JN1CA31D91
P0171: Fuel Trim Lean (Bank 1). Greetimgs to all I have this maxima that sets a code 171 bank2 system lean I have smoked the engine for vaccum leaks and none were found.I tested the o2 sensor and it seems to be swinging properly.I have changed mass air flow sensors on these maximas for the s...
February 27, 2006