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P0171 Diagnostic Trouble Code Discussion for September 2008

Fuel System Lean (Bank 1) *

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Trouble Ticket Help Requests for DTC P0171

	Help Request	Posted
	2002 Hyundai Sonata 2.4L hard start VIN: KMHWF25S72 P0171: Fuel System Too Lean (Bank 1). ... sonata 2.4. customer complains of intermittent hard start, ses light. scanned, found p0171 lean code. fuel trims and o2 data looks fine, no vaccum leaks to be found. fuel pressure ok. maf readings seemed to be sluggish, so we replaced the maf. no change. i...	September 04, 2008
	1999 Mazda Protege DX 1.6L MIL Lamp on VIN: JM1BJ2220C P0171: Adaptive Fuel Trim Too Lean (Bank 1). code p0171 on, replaced air flow meter and air boot. light came on again 1 day later. we replaced air flow meter again numbers still high. o2 switches good, but tends to hang on the righ side even with high fule trim numbers. long term camps out around 12-14 a...	September 04, 2008
	2001 Volkswagen Jetta GLS 2.0L MIL Lamp on VIN: 3VWSK69M11 P0171: lean bank 1. I have this vw with lean code p0171 . everything seems to look good . o2 sensor was replaced first and we drove 50 miles and returned to the customer it was good for a day then the light came back on. I checked the archieves and found that it was pretty common...	September 08, 2008
	2001 Volkswagen Jetta GLS 2.0L MIL Lamp on VIN: 3VWSK69M11 P0171: lean bank 1. I have this vw with lean code p0171 . everything seems to look good . o2 sensor was replaced first and we drove 50 miles and returned to the customer it was good for a day then the light came back on. I checked the archieves and found that it was pretty common...	September 09, 2008
	2005 GMC Envoy SLE 4.2L MIL Lamp on VIN: 1GKDT13S05 P0171: Fuel System Lean (Bank 1). thanks in advance to all who help. vehicle came in this morning with the check engine light on. hooked up scan tool, found [...]: system lean bank 1. monitored data stream. STFT:29. LTFT:19. MAP:30. HO2S1:.045v. spec calls for HO2S1 to be 200-800mv. i am leani...	September 10, 2008
	2004 Subaru Impreza WRX 2.0L Poor Idle Quality, Hesitation, Stall, Misfire, MIL Lamp on VIN: JF1GD29624 P0171: Fuel System Too Lean (Bank 1). vehicle has a rough idle and hesitation in acceleration. found 3.754 volts at front a/f sensor and rear o2 sensor has 0.075 volts and fluctuates very slowly - never above o.100 volts. short term fuel trim 25%.	September 10, 2008
	2004 Honda Civic EX 1.7L MIL Lamp on VIN: 1HGES26734 P0171: Fuel System Too Lean. Car seems weak on power, otherwise runs OK. Code if cleared will reset almost immediately. Fuel pressure is good. Any help would be appreciated. Thanks	September 12, 2008
	1996 Oldsmobile Cutlass Ciera 3.1L Poor Idle Quality, Poor Fuel Economy, MIL Lamp on VIN: 1G3AJ55M5T P0171: Fuel System Lean. ... fuel trims and idle hunts up and down. yes the miles are right not 100,000car recently bought from old couple that never drove it.little known about history of car.we have hit a brick wall on this one.would appreciate any help.we've done all we can think o...	September 15, 2008
	2005 Volvo S40 i 2.4L MIL Lamp on VIN: YV1MS38245 P0171: Lean Exhaust. ... vacuum type noise and an MIL. Code P0171 (lean) was stored. The noise was from a broken PCV vent pipe that goes from the valve cover to the "PCV" (for lack of a better term!)/oil filter adaptor housing. Found that in addition to the broken vernt ho...	September 15, 2008
	2005 Volvo S40 i 2.4L MIL Lamp on VIN: YV1MS38245 P0171: Lean Exhaust. ... vacuum type noise and an MIL. Code P0171 (lean) was stored. The noise was from a broken PCV vent pipe that goes from the valve cover to the "PCV" (for lack of a better term!)/oil filter adaptor housing. Found that in addition to the broken vernt ho...	September 16, 2008
	2005 Ford Mustang 4.0L MIL Lamp on P0171: Lean Bank 1. Hey there Ford techs! Have a real problem child here. Long term FT at 25+, and STFT at 15+ at all times and speeds. Fuel Pump failing under high load, and FPCM showed evidence of being submerged in trunk. MAF failed VE efficiency test, and through bad info rep...	September 18, 2008
	2003 Kia Rio Cinco 1.6L Poor Idle Quality, MIL Lamp on VIN: KNADC16533 P0171: Fuel System Too Lean. Good day people. I have this KIA Rio that idles very rough. MIL will come on and transmission will not down shift into passing gear when throttle pedal floored. When vehicle came in first time had codes for MAF sensor and system too lean. No reading out of MAF...	September 18, 2008
	2002 Kia Sportage 2.0L MIL Lamp on VIN: KNDJB723X2 P0171: Fuel System Too Lean (Bank 1). I am not all that familier with KIA but hear the computer issues are vast. The vehicle runs great, plugs, wires, air all good, found no vacuum leak but has the 171 lean mis-fire code. I have been told computer reprogramming may be the solution. MAF was cleaned...	September 19, 2008
	2003 Kia Rio Cinco 1.6L Poor Idle Quality, MIL Lamp on VIN: KNADC16533 P0171: Fuel System Too Lean. Good day people. I have this KIA Rio that idles very rough. MIL will come on and transmission will not down shift into passing gear when throttle pedal floored. When vehicle came in first time had codes for MAF sensor and system too lean. No reading out of MAF...	September 19, 2008
	2000 Nissan Sentra GXE 1.8L No Start, Poor Idle Quality, Cuts out, Stall, Misfire, MIL Lamp on VIN: 3N1CB51D4Y P0171: Fuel Trim Lean. when car does start-it is so lean, it turn the cat red in minutes--ran with cat disconnected--car runs the same--injectors and coils seem intermittent--rpm does not drop out--very limited data on modis-suspecting cam or crank sensor problem-but not much nissan...	September 21, 2008
	2006 Toyota Sienna LE 3.3L MIL Lamp on VIN: 5TDZA23CX6 P0171: Fuel System Too Lean (Bank 1). This vehicle has been in several times for ck engine light with codes po174, po171. We have smoke tested for vacuum leaks---none found. Checked fuel pressure--ok. Replaced bank 2 a/f ratio sensor per service bulletin. Replaced MAF. Vehicle still sets codes int...	September 22, 2008
	1999 Toyota Tacoma Pre Runner 3.4L MIL Lamp on VIN: 4TASN92N8X P0171: Fuel System Too Lean (Bank 1). I have a lean code that doesn't appear to be MAF related. MAF is clean and calc load is 82% under full throttle which tells me the MAF is ok. Long term fuel trims are 18% at idle and drops to about 5% during cruise which also tells me that the MAF is fine but ...	September 29, 2008
	1994 Pontiac Bonneville SSE 3.8L No Start, Cuts out, Stall, Poor Fuel Economy VIN: 1G2HZ5216R P0171: system lean. Good morning guys, and apologies for the long post here. It's been awhile since I've needed to ask for help here, but i have this stumper. the car came to me, with the complaint of stalling "violently", and then sometimes not re-starting. I had the c...	September 30, 2008
	1996 Pontiac Sunfire SE 2.2L Stall VIN: 3G2JB24XTS P0171: Fuel System Lean (Bank 1). Hi techs, got this 96 sunfire in with a complain of stalling after long period of driving. Usually happens when rolling down to the intersection and wait for red light. It would stall and restart right away. After it happens, it needs another half a day or so ...	September 30, 2008