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P0171 Diagnostic Trouble Code Discussion for March 2011

Fuel System Lean (Bank 1)


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Trouble Ticket Help Requests for DTC P0171
Help Request Posted
2002 GMC Yukon Denali 6.0L Misfire, MIL Lamp on VIN: 1GKEK63U62
P0171: Fuel Trim System Lean (Bank 1). ... light, found code p0300, scanned and found all cylinders had some misfiring. Checked spark plugs and they were due for replacement. Installed plugs with new wires. customer drove for a few daysw and returned with CEL back on. Scanned and found p0300, check...
March 01, 2011
2003 Jaguar S-Type 4.2L Excessive Emissions, Poor Idle Quality, Misfire VIN: SAJEA01U03
P0171: Bank 1 lean. Keep in mind this is a new used car for a customer that bought the vehicle in this condition, so I have no history of when/what symptoms started. Vehicle was brought in with restricted performance light on, rough idle condition, and a rubbed through radiator h...
March 01, 2011
2003 Volkswagen Passat GL 1.8L MIL Lamp on VIN: WVMPD63B53
P0171: B1 lean. Hi techs, i couldn't find test for code p2181 on mitchell on demand,anybody seen or fix this code?also i'm getting lean code,no intake leak,i'm leaning on maf.btw i'm using generic scan.slight throtle the maf goes 10 gram the st -11 b1s1 o2 is not on the data ...
March 01, 2011
2005 Chevrolet Cobalt LT 2.2L Misfire VIN: 1G1AZ54F95
P0171: Fuel System Lean. Help!!! this car is a nasty one. Been in and out of shop with engine missing problem. Every time it comes in it has no spark to cylinder #2 and #3. First time i replaced all spark pluges, ignition coil and ignition module all after market parts. Second time in...
March 02, 2011
2007 Jeep Grand Cherokee Limited 5.7L MIL Lamp on VIN: 1J8HR58227
P0171: Fuel System Lean (Bank 1). ... Code P0171/P0174 stored in memory. Performed the usual, inspecting for vacuum leaks and all air intake hoses to throttle body. Fuel pressure is well within specs and Jeep runs great. No rough idle or any perfomance issues...
March 02, 2011
2006 Toyota Solara SLE 3.3L MIL Lamp on VIN: 4T1CA30P46
P0171: Fuel System Too Lean (Bank 1). ... Codes p0171 and p0174. Bank one and two lean. Check intake for leaks with smoke. None found. After diving for a few min. Ltft goes to 40 or above at cruise. Replaced maf and o2 sensors with no change. Do we need to flash computer? disconected battery over ...
March 02, 2011
2000 Nissan Sentra GXE 1.8L Poor Idle Quality, Stall VIN: 3N1CB51D6Y
P0171: Fuel Trim Lean. Hi every body! Wishing you all are OK. Next I want to beg you for your help. It's about a 2000 NISSAN Sentra 1.8L. In the last 2 years this car has given some problems like no starting and no power. This time it came with c. e. light with codes po171 and po174...
March 04, 2011
2000 Nissan Sentra GXE 1.8L Poor Idle Quality, Stall VIN: 3N1CB51D6Y
P0171: Fuel Trim Lean. Hi every body! Wishing you all are OK. Next I want to beg you for your help. It's about a 2000 NISSAN Sentra 1.8L. In the last 2 years this car has given some problems like no starting and no power. This time it came with c. e. light with codes po171 and po174...
March 05, 2011
2003 Toyota Tacoma S-Runner 3.4L Poor Idle Quality, Hesitation, Surge, Cuts out, Poor Fuel Economy, MIL Lamp on VIN: 5TEWN72N13
P0171: Fuel System Too Lean (Bank 1). ... loop (warmed up), it will run ok for a short while then will surge and nearly cut off or cut off at idle. It also appears to have a lean surge at WOT. Depressing the accelerator halfway or less, the engine seems to accelerate fine accordingly. After the en...
March 08, 2011
2007 Ford Escape XLT 3.0L Stall, MIL Lamp on VIN: 1FMCU93107
P0171: Fuel System Too Lean (Bank 1). I smoke tested this for vacuum leaks. I get over .5 liters flow of smoke coming out of the EGR valve vents(under diaprahm). I remove EGR and plug intake, then get .2 liters flow. I cant find smoke but hear gurgling when dipstick is pulled. I tried 2 new OEM EG...
March 09, 2011
2003 Toyota Tacoma S-Runner 3.4L Poor Idle Quality, Hesitation, Surge, Cuts out, Poor Fuel Economy, MIL Lamp on VIN: 5TEWN72N13
P0171: Fuel System Too Lean (Bank 1). ... loop (warmed up), it will run ok for a short while then will surge and nearly cut off or cut off at idle. It also appears to have a lean surge at WOT. Depressing the accelerator halfway or less, the engine seems to accelerate fine accordingly. After the en...
March 09, 2011
2007 Ford Escape XLT 3.0L Stall, MIL Lamp on VIN: 1FMCU93107
P0171: Fuel System Too Lean (Bank 1). I smoke tested this for vacuum leaks. I get over .5 liters flow of smoke coming out of the EGR valve vents(under diaprahm). I remove EGR and plug intake, then get .2 liters flow. I cant find smoke but hear gurgling when dipstick is pulled. I tried 2 new OEM EG...
March 10, 2011
2000 Jaguar XK8 4.0L MIL Lamp on VIN: SAJJA42C7Y
I have a 2000 XK8 with P0171 & P0174 lean bank 1 & 2 codes. Smoke test revieled a leak at the induction elbow where the brake booster vacuum line connects to the induction elbow. This is right next to the vaccum supply for the fuel regulator. After wai...
March 10, 2011
2003 Subaru Forester X 2.5L Surge VIN: JF1SG63623
P0171: Fuel System Too Lean (Bank 1). Car will start to surge when under a load above 3,500 rpm . Engine starts and idles normally and accelerates up to 3,500 rpm normally . Tried a new subaru front o2 sensor first - did not change . Checked fuel pressure 30 psi at idle - 41 psi with hose off regu...
March 10, 2011
2003 Subaru Forester X 2.5L Surge VIN: JF1SG63623
P0171: Fuel System Too Lean (Bank 1). Car will start to surge when under a load above 3,500 rpm . Engine starts and idles normally and accelerates up to 3,500 rpm normally . Tried a new subaru front o2 sensor first - did not change . Checked fuel pressure 30 psi at idle - 41 psi with hose off regu...
March 11, 2011
2003 Ford F-550 Super Duty XL 6.8L MIL Lamp on, Monitors won't run VIN: 1FAFP57BU1
P0171: B1 Sys. Lean. ... due to incomplete monitors. When I got it the MIL was on with a P0171 and P0174, FF data shows normal operating temp and 1465rpm. Checked Mode 6 data and all values seem to be false "phantom" values. I/M status sho...
March 15, 2011
2002 Ford Mustang 3.8L MIL Lamp on VIN: 1FAFP40432
P0171: Bank One System Too Lean. I have a basket case here. I got this car from the auction it came from New Mexico where there is no emissions. It came in with aftermarket dual exhaust (no H-pipe) and B1S2 code and found there was NO bung hole for the rear O2 and no O2 either!! Repaired/inst...
March 16, 2011
2003 Jaguar S-Type 4.2L Excessive Emissions, Poor Idle Quality, Misfire VIN: SAJEA01U03
P0171: Bank 1 lean. Keep in mind this is a new used car for a customer that bought the vehicle in this condition, so I have no history of when/what symptoms started. Vehicle was brought in with restricted performance light on, rough idle condition, and a rubbed through radiator h...
March 16, 2011
2005 Subaru Legacy i 2.5L Hesitation, Cuts out, Stall VIN: 4S4BP61C15
P0171: Fuel System Too Lean (Bank 1). Customer came in and complaint was after everytime they put fuel in the vehicle, it does not want to start. Vehicle will stall, cut out and sputter. Customer indicates if he holds down gas pedal vehicle will eventually start. I cleaned canister filter, blew ou...
March 16, 2011
2007 Chevrolet Express 2500 4.8L Poor Idle Quality, Cuts out VIN: 1GCG29YV57
P0171: Fuel Trim System Lean (Bank 1). hello, hope everyones day is going well? we have a 2007 chevy express 2500 with an interseting problem. the customer is concerned about it stalling in reverse and idling poorly ONLY when vehicle is hot. the transmission was rebuilt about 500 miles ago, but i...
March 17, 2011
2005 Chrysler PT Cruiser GT 2.4L Poor Idle Quality, MIL Lamp on VIN: 3C8FY78G55
P0171: Fuel System Lean. After replacing a broken timming belt with no history on the car. Check eng light came on with a lean code , tested fuel pressure ,smoked intake,and found no leaks or fuel pressure problems at this time . Also it is at max lean at idle and at high speed . Now ...
March 19, 2011
2005 Chrysler PT Cruiser GT 2.4L Poor Idle Quality, MIL Lamp on VIN: 3C8FY78G55
P0171: Fuel System Lean. After replacing a broken timming belt with no history on the car. Check eng light came on with a lean code , tested fuel pressure ,smoked intake,and found no leaks or fuel pressure problems at this time . Also it is at max lean at idle and at high speed . Now ...
March 20, 2011
2005 Volkswagen Jetta 2.5 2.5L MIL Lamp on VIN: 3VWSF71KX5
P0171: Fuel correction at limit. ... with P0101, P0102,P0304, and P2403 codes. We were not addressing the evap code at that time. I installed a VW Maf and cleared codes. Stall issue is corrected. On March 4 the car returned wi...
March 22, 2011
2005 Volkswagen Passat GLS 4 Motion 1.8L Poor Idle Quality, Hesitation, Misfire, MIL Lamp on VIN: WVWDD63B95
P0171: lean fuel system bank1. Hi, I can't believe I am asking such a seemingly simple question. But after 3 hours I cannot find the PCV valve on this car. I have googled it, searched Alldata, and looked all over the vehicle. Everything says it is under the intake manifold. I still cant fin...
March 24, 2011
1996 Cadillac Seville SLS 4.6L Poor Idle Quality, Extended crank time VIN: 1G6KS52Y4T
P0171: Fuel Trim System Lean (Bank 1). ... because of a extended crank time when starting, about 5 to 10 seconds. It sputters a little before catching,also.It sometimes has a slightly rough idle. P0300 did not come back after clearing. I first though it was low fuel...
March 28, 2011
2000 Dodge Caravan 3.0L Excessive Emissions, Poor Idle Quality, Poor Fuel Economy, MIL Lamp on VIN: 2B4GP2539Y
P0171: Fuel System Lean (Bank 1). ... you for your help, cause I’m getting my As…handed to me on this one. When I clear the codes and the adaptations and the Fuel trims are zeroed out, and I start the car it will run very rough and it almost seems like its misfiring a bit. It takes about one t...
March 29, 2011
1999 Ford Windstar SE 3.8L Hesitation, Surge, Cuts out, MIL Lamp on VIN: 2FMZA5242B
P0171: system too lean bank 1. this van came into the shop with a surging problem and would die.when accelrating it would have a hestation,then if you would watch the plastic plimton,only when you would accelarate the plimtom would grow and then when you would let off it would go back to no...
March 31, 2011
1999 Ford Contour SE 2.0L MIL Lamp on
P0171: system lean. ... is the check engine light p0171,the first thing i checked was the freeze frame,code was set at idle theen i looked at the data stream,maf was reading .3v at idle and front o2 was reading 0,raizing the rpm after a few seconds o2 started flucktuating and maf...
March 31, 2011
1995 Lincoln Continental Signature 4.6L Stall, Misfire, Poor Fuel Economy VIN: 1LVLM97V2S
P0171: Bank 1 lean. I've got a thorn in my side with this one. This is actually my parents vehicle and I would like to finally get this one repaired. I am having a couple problems. First off I am getting eronious readings from my MAF allowing the BARO reading to be off. The readi...
March 31, 2011
2001 Lincoln LS 3.9L Poor Idle Quality, MIL Lamp on VIN: 1LNHM87A41
P0171: Lean bank 1. Hey Fellow Techs I need some help. This Licoln LS is running very poor at idle. Bank 1 is very lean. Smoked for vacuum leaks, did not see any. Decided to change intake gaskets any way. No help. Replaced B1S1 o2, cleaned maf, replaced fuel filter and cleaned in...
March 31, 2011