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P0171 Diagnostic Trouble Code Discussion for March 2005

Fuel System Lean (Bank 1)


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Trouble Ticket Help Requests for DTC P0171
Help Request Posted
1999 Ford Contour SE 2.5L Cuts out, Stall VIN: 3FAFP66L8X
note: engine will stall at a cold idle, once motor is warm engine performs well. over 11 different fault codes were present when it was first scanned. only p071, p0174 will return. fuel delivery inspects well, ignition monitors well upon scope analysis. believ...
March 01, 2005
1999 Toyota Avalon XL 3.0L Excessive Emissions, MIL Lamp on VIN: 4T1BF18B3X
P0171: Fuel System Too Lean (Bank 1). Car came in with a lean code about 2 weeks ago. I could find nothing wrong. I cleared the code and informed the customer that I could not find anything and we may have to try a MAF sensor. I was a little leary of replacing it because I had never seen this styl...
March 01, 2005
2001 Isuzu Rodeo Sport S V6 3.2L Stall, MIL Lamp on VIN: 4S2CK57W21
P0171: Fuel System Too Lean (Bank 1). Sorry to just throw this one at you, but here it is. I don't really have alot of diagnostic info on this vehicle. Anyway, there was initially an intermittent drivability problem. Now the car stalls sometimes.
March 03, 2005
2000 Nissan Sentra GXE 1.8L Boggs Down, No Power VIN: 3N1CB51D7Y
P0171: Fuel Trim Lean. Guy's this one is a good one. We have this vehicle that came in for a bad Cat. Converter which was diag from another shop. Customer asked us to install a new one. The unit was from the dealer {direct bolt on}. Before and after installation when you would first...
March 03, 2005
2000 Ford Windstar SEL 3.8L Poor Fuel Economy, MIL Lamp on VIN: 2FMZA5346Y
P0171: bank one lean. hi guys i need help with this windstar. it runs lean at idle only but runs good. fuel trims are at the rich stop 25 % b1 and b2. i have replaced all the intake gaskets,front valve cover per tsb the fuel pressure regulator hose the pcv hose. these are the thing...
March 05, 2005
2000 Chrysler Sebring JXi 2.5L MIL Lamp on VIN: 3C3EL55H7Y
P0171: Fuel System Lean (Bank 1). Vehicle has intermittant mil with code #P0171 (Fuel system running lean), if vehicle is ran from cold start the primary O2 sensor switches rich/lean as it should for approximately 15 min to 1 hr. After it is idling hot for an extended period of time the O2 reg...
March 07, 2005
2002 Chevrolet Tahoe LS 5.3L Misfire, MIL Lamp on VIN: 1GNEK13ZO2
P0171: Fuel Trim System Lean (Bank 1). Hi erveryone and thanks for the soon coming help. I just got put on this tahoe to try to repair a misfire problem on cyl #'s 4 and 5. #5 misfires increased quickly when first started even after previous mechanic installed new plugs and wires.#4 came up also bu...
March 08, 2005
1998 Ford F-150 Lariat 4.6L MIL Lamp on VIN: 2FTZX1768W
P0171: A/F Ratio too lean. ... O2 sensors after checking for vac leaks,fuel pressure &flow.Vehicle came back today with same codes P0171&174 A/F rato too lean at max rich limit.WE checked everything we could think of and followed flow chart from Motors.Are we missing something s...
March 09, 2005
1999 Pontiac Grand Am SE 2.4L Excessive Emissions, Poor Fuel Economy, MIL Lamp on VIN: 1G2NE52T7X
P0171: Fuel System Lean. this 2.4 is running very rich,black smoke from tail pipe.fuel trim index goes to 98 after running about 15 seconds.vaccuum at idle is 17".replaced intake gasket,removed front timing chian cover and checked chian,seems to be right on the marks.replaced up s...
March 09, 2005
2003 Chrysler PT Cruiser 2.4L Cuts out, MIL Lamp on VIN: 3C4FY48B83
P0171: Fuel System Lean. ... get. We got this pt in after a recent trans rebuild from a commercial company of ours, Original complaint MIL light on intermitant stall on take off, we found os sensor not switching , replaced now switching also found wires from 02 harnes pulled loose,we ...
March 12, 2005
1999 Cadillac Catera 3.0L MIL Lamp on VIN: WO6VR5ZR5X
P0171: Fuel Trim System Lean (Bank 1). ... on.Scaned for codes and P0171 was stored.The datastream was kind of weird because when using generic OBD-II mode,the fuel trims show as though they were normal.When swithing to VIN specific,the fuel trims showed that both banks #1 and #2 were showing they ...
March 13, 2005
1998 Ford F-250 Lariat 4.6L Poor Idle Quality, Misfire, Hard Start VIN: 1FTRX2766W
P0171: bank 1 lean. Hello All, I am looking for some help before this thing eats my next weeks meals. It has had my last two already. Truck came in missing with 304, 171 and 174 codes and fuel trim at 25%. I put in plugs, wires and cleaned the MAF. When I got done the thing still...
March 15, 2005
1997 Ford F-250 Lariat 5.4L Misfire, MIL Lamp on VIN: 1FTEX27L4V
P0171: system lean on both banks. ... light on and rough running, found codes p0171 and p0174 ( system lean on both banks ) checked for vacuum leaks, fuel pressure ok. scanner showed poor reaction time from left oxygen sensor and they were both very rusty, we also had a large vacuum leak comin...
March 17, 2005
2002 Jaguar X-Type 3.0L MIL Lamp on VIN: SAJEA53C72
Hello Jag guru's, Got this Jag that is my accountant's car, We failed him for odb2 state inspection, Mitchell does not have any info on these codes, wondering if you guys have seen these codes if it is a common problem. Codes PO171 PO174. Thanks Brian [...]
March 18, 2005
1997 Ford F-250 Lariat 5.4L Misfire, MIL Lamp on VIN: 1FTEX27L4V
P0171: system lean on both banks. ... light on and rough running, found codes p0171 and p0174 ( system lean on both banks ) checked for vacuum leaks, fuel pressure ok. scanner showed poor reaction time from left oxygen sensor and they were both very rusty, we also had a large vacuum leak comin...
March 21, 2005
1999 Ford Explorer XL 4.0L MIL Lamp on VIN: 1FM3U32X0X
P0171: bank1 lean. help!!! 99 ford explorer with 4.0. bank1 and bank2 lean limit. found tsb for maf sensor contamination. changed maf sensor. car keeps coming back three days later setting mil light. i do not have smoke machine to check for vacuum leaks. to my knowledge none are...
March 21, 2005
2000 Chevrolet Blazer LS 4.3L Misfire, Poor Fuel Economy, MIL Lamp on VIN: 1GNDT13W4Y
P0171: Fuel System Lean (Bank 1). ... fuel eco. When I scan trim after driving a while they appear normal values less than 5% both banks. but when I WOT once or twice the B1 values go to 50.00% and will not come down untill you drive for a while. All plugs/ignition new. I suspect pluged inject...
March 23, 2005
1999 Toyota Avalon XL 3.0L Excessive Emissions, MIL Lamp on VIN: 4T1BF18B3X
P0171: Fuel System Too Lean (Bank 1). Car came in with a lean code about 2 weeks ago. I could find nothing wrong. I cleared the code and informed the customer that I could not find anything and we may have to try a MAF sensor. I was a little leary of replacing it because I had never seen this styl...
March 23, 2005
2000 Toyota Tacoma DLX 3.4L MIL Lamp on VIN: 4TAWN72N1Y
P0171: Fuel System Too Lean (Bank 1). ... truck. The MIL comes on with Too Lean P0171 every time It is driven on the interstate, it runs smooth but is a bit sluggish, it has a small hesitation on acceleration. The oxygen sensor is ranging rich to lean 5 to 6 times in 10 seconds at 2,000 RPM but fl...
March 24, 2005
2000 Ford Escort LX 2.0L MIL Lamp on VIN: 3FAFP13PXY
P0171: lean mixture. ... time in between paid jobs to diagnois). This car keeps coming back with a p0171 lean mixture code. I replace the 02 sensor, the vaccum tee at the intake manifold was leaking so I replace that hose assy. My smoke machine is down. I added propane at the inta...
March 28, 2005
1998 Honda Accord EX 2.3L Hesitation, MIL Lamp on VIN: 1HGCG5651W
P0171: Fuel System Too Lean (Bank 1). All engine data is normal except O2s readings which stay lean. no other sensors are out of spec. there are no other performance problems with car, and vehicle runs perfectly otherwise. If fuel mixture is richened hesitation subsides. coolant is full and ect is...
March 28, 2005
2002 Ford E-150 Econoline 4.2L Misfire, MIL Lamp on VIN: 1FTRE1462H
P0171: Lean bank 1. any help you guy's could give we would be thankful.
March 29, 2005
2001 Volkswagen Jetta GLS 2.0L Hesitation, Surge, MIL Lamp on VIN: 3VWSK69M31
P0171: system lean. ... would not accel when driving. I have corrected the code p0351 which was a bad coil pack and to be safe I replaced the very common MAF. The only code that has reoccurred after 2 test drives is the p0343 CMP sig high. Howe...
March 29, 2005
2000 BMW M5 5.0L MIL Lamp on VIN: WBSDE9346Y
P0171: lean bank 1. vehicle runs a little rough on start up. fuel trims at max. long terms at 25% both banks. inspected MAF sensors(has two) appear to be working ok. exhaust has rich odor to it. removed upper intake cover for inspection looks ok. no PCV system, has oil separators...
March 31, 2005