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P0171 Diagnostic Trouble Code Discussion for February 2008

Fuel System Lean (Bank 1)


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Trouble Ticket Help Requests for DTC P0171
Help Request Posted
2001 Ford E-250 Econoline 4.2L Poor Idle Quality VIN: 1FTNE24291
P0171: Bank 1 Lean. Vehicle came in with the codes PO171 & 174, both banks lean, I found & repaired a vaccum leak @ the PCV hose. I then test drove the vehicle for a short distance & the codes did not reappear but I still had a rough idle. Suspecting a hung EGR valve...
February 01, 2008
2001 Ford Taurus SE 3.0L No Power VIN: 1FAFP53271
P0171: lean bank 1. Hi Everyone! Thanks in advance for your help here. I have here a taurus that has no power on accel, it is the classic symptoms of low fuel pressure or clogged exhaust, the more throttle you give it, the slower it goes, and it just sounds very labored. The misf...
February 01, 2008
1996 Ford Windstar GL 3.8L Poor Idle Quality, Surge, Misfire VIN: 2FMDA5142T
P0171: lean. starts and runs fine. after its hot and sits for about 10 min restart and it is running rough. it acts light heavy miss. hit the gas and it will clear up after a few seconds. fuel pressure is good, no injector leaks, good compressiion. if it runs ok after a so...
February 02, 2008
1998 Ford Explorer Sport 4.0L MIL Lamp on, po171 po174 VIN: 1FMYU22E0W
P0171: system lean bank 1. hello this is the explorer from hell. Came in with po171 & po174, smoked and found intake gaskets leaking. Replaced upper and lower plenum gaskets. Problem still persists. maf reading is okay. At idle shorterm=3% longterm=2%. of idle and while driving shor...
February 02, 2008
2005 Dodge Neon SXT 2.0L Stall, MIL Lamp on VIN: 1B3ES56C65
P0171: Fuel System Lean (Bank 1). Customer complains of check engine light on, and states engine stalls while driving. I've road tested vehicle several miles without verifying stalling concern, fuel trims looked ok on road test, however the freeze frame data showed a lean condition, LFT1 +28%,...
February 04, 2008
1998 Oldsmobile Intrigue 3.8L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1G3WH52K3W
P0171: Fuel System Lean. Vehicle is setting lean codes currently. Replaced reman maf again and havent reset maf code again. Vehicle will upon start up will miss a few times on all cylinders intill vehicle goes into clode loop. Fuel trims are 20+ shrt and 16+ lgterm I have smoke tested...
February 04, 2008
2001 Ford F-150 XL 4.2L MIL Lamp on VIN: 1FTZX17271
P0171: System to Lean Bank 1. All Ford Drivability Guys I have a lean condition with this F-150. I have checked for vacuum leaks, replaced the fuel filter, checked fuel pressure (35)psi. When I looked at the PID I saw this occured with engine RPM at 1054, Calc Load 44.0, Coolant Temp 172, ...
February 05, 2008
2000 Ford Windstar SE 3.8L Stall VIN: 2FMZA524XY
hello to all, i need some assistance on a 2000 ford windstat 3.8L trying to locate the lower intake manfold the one off the above vehicle is leaking from the area where the runner shaft is mounted the local ford dealer told me it is on national back order . if...
February 06, 2008
2002 BMW 530i 3.0L Hesitation, MIL Lamp on VIN: WBADT63402
P0171: system too lean bank 1. ... Please. When I first got this car. It tested drove ok. the complaint is Engine light on. Hesitates at a stand still. OK.. pulled codes. So what I needed to know is the code p0313 misfire detected with low fuel.. no flow chat in alldata. best I could get wi...
February 07, 2008
1999 Ford Windstar SE 3.8L MIL Lamp on VIN: 2FMZA524XX
P0171: b1 lean. we have done the tsb for the 171 and the 174 codes and this van is back we have two shops and this car was done at our other shop now im blessed with this pain after our other tech threw a bunch of other parts at it and itrs still not fixed my freeze frame inf...
February 07, 2008
2000 Lexus RX300 3.0L Poor Idle Quality, Surge, MIL Lamp on VIN: JG198G45LO
P0171: system lean. ... and stalling. Mil was on but not running poorly when roadtested. Found multiple dtcs po171, p1130 and p1150. Diagnosed and changed both a/f sensors. Cleared dtcs and started vehicle. idle started to surge and then stabiliz...
February 08, 2008
1999 Ford Windstar SE 3.8L MIL Lamp on VIN: 2FMZA524XX
P0171: b1 lean. we have done the tsb for the 171 and the 174 codes and this van is back we have two shops and this car was done at our other shop now im blessed with this pain after our other tech threw a bunch of other parts at it and itrs still not fixed my freeze frame inf...
February 10, 2008
1998 Ford Ranger Splash 4.0L MIL Lamp on VIN: 1FTZR15X8W
P0171: lean. we have had several 1998-2000 come in with same codes and have cleaned maf , checked fuel pressure , egr , and still come up with same codes some in days or a month later
February 12, 2008
2001 Nissan Sentra GXE 1.8L Poor Idle Quality, Hesitation, Cuts out, Stall, Misfire VIN: 3N1CB51D41
P0171: Fuel Trim Lean. absolute pressure and atmospheric pressure both read 3.94v and never change even at wide open throttle cant seem to find the info i want
February 13, 2008
2002 Ford Windstar LX 3.8L MIL Lamp on VIN: 2FMZA50442
P0171: both banks lean. ... coming on. We have replaced both intake manifold gaskets. Light came back on. Smoked intake, replaced PCV valve, light came back on. Allways the same codes, Po171 and P0174. Any ideas?
February 14, 2008
2005 Ford Taurus SE 3.0L MIL Lamp on VIN: 1FAHP53U15
P0171: fuel system lean bank 1. We tested fuel pressure at the line that goes into rail show only 28psi when running.Tested pressure at the pump output before the filter 55psi and have a same reading after the filter.Disconnect the line that goes to rail pump output 55psi key on engine off.T...
February 18, 2008
2005 Ford Taurus SE 3.0L MIL Lamp on VIN: 1FAHP53U15
P0171: fuel system lean bank 1. We tested fuel pressure at the line that goes into rail show only 28psi when running.Tested pressure at the pump output before the filter 55psi and have a same reading after the filter.Disconnect the line that goes to rail pump output 55psi key on engine off.T...
February 19, 2008
2000 Ford Explorer XLS 4.0L MIL Lamp on VIN: 1FMZUTTE51
P0171: lean bank 1. This vehicle has been back a few times. it has a lean code on bank 1 and 2. When i monitor pid data everything is normal idling and when driving. I have monitored fuel pressure and smoke tested for vacuum leaks. I am kind of embarrased because this shouldnt be...
February 21, 2008
1998 Toyota Camry CE 3.0L MIL Lamp on VIN: JT2BF22KXW
P0171: Fuel System Too Lean (Bank 1). ... dealership sold now the code p0171 fuel system lean is on and the traction control light comes on. now the first thing I noticed was the air in let tube from maf to throttle body all clamps loose and not seated properly took care of that the light stayed o...
February 21, 2008
2001 Ford Expedition XLT 5.4L MIL Lamp on VIN: 1FMPU16L51
P0171: bank 1 lean. Car came in with Code po171. Cleaned MAF sensor no problems found with it. checked PCV hose for collapsing and for leaks none found. Cleared codes and customer came back a week later with code po171 again. Took a closer look at the o2 sensors and when I run th...
February 25, 2008
2001 Hyundai Santa Fe GL 2.4L No Start, Stall, Misfire, MIL Lamp on VIN: KM8SB82B21
P0171: Fuel System Too Lean (Bank 1). This vehicle was driven in for running poorly and noisy engine. The above codes were stored in the computer. Upon inspection we found the timing belt missing teeth. I replaced it and the cam sensor. We sent the vehicle home the only complaint he had to open th...
February 25, 2008
1997 Dodge B2500 3.9L Hesitation, Cuts out, Misfire VIN: 2B7HB21X7V
P0171: Fuel System Lean (Bank 1). hello fellow mechs. this vehicle will only go about 10 miles an hour when it starts to malfunction. i had to drive it on the highway for about 10 miles before it started to malfunction. around town it's fine. the one thing i noticed when it does malfunction is...
February 26, 2008
2001 Honda Odyssey EX 3.5L MIL Lamp on VIN: 2HKRL18601
P0171: Fuel System Too Lean (Bank 1). Could plugged fuel injectors cause this PO171 lean code? We cannot fault the o2 sensors or mass air flow sensor or fuel pressure as all these are in spec. If we suspect plugged injectors is there a definitive test? Or do we just pressure clean them and see if ...
February 26, 2008
1996 Lincoln Continental Anniversary 4.6L MIL Lamp on VIN: 1LNLM97V2T
Just need to know if anyone out there has replaced the lower intake manifold control shaft seals on one of these engines. I'm told the manifolds are no longer available through Ford. My dealer did locate 7 left side ones at $395.00 each from their vintage sour...
February 26, 2008
2006 Toyota Matrix XR 1.8L Cuts out, Misfire, MIL Lamp on VIN: 2T1KR32E96
P0171: Fuel System Too Lean (Bank 1). ... fleet. The check engine light would come back on after a few weeks of driving. P0171. We replaced the MAF sensor about a month ago. Ran vehicle through drive cycle and readings look fine at the time. Now the light is back on. Not too sure where to go from ...
February 26, 2008
2000 Ford Taurus SE 3.0L MIL Lamp on VIN: 1FAFP58S3Y
P0171: system lean bank 1. first visit. customer arrived with c.e.l on no driveability sypmtoms. retrieved dtc's po174 and po171. lean codes. smoke test found bad pcv hose assembly. replaced. noticed fuel filter old, replace for maintenance reasons being it was related. cleaned mass air...
February 28, 2008