Join Now
International Automotive Technicians Network

P0171 Diagnostic Trouble Code Discussion for April 2008

Fuel System Lean (Bank 1)


Note: This is a professional automotive technician's resource.
Vehicle Owners: If you are seeking an automotive repair professional to service your vehicle, visit the iATN Repair Shop Finder.

Trouble Ticket Help Requests for DTC P0171
Help Request Posted
2000 Lexus RX300 3.0L MIL Lamp on VIN: JT6HF10U3Y
P0171: bank1 sensor one lean condition. Hello everyone I have this RX300 that keeps setting PO171 code, replaced bank1 sensor one air fuel sensor, checked fuel pressure, 48-50PSI at idle or WOT, cleaned air flow sensor, coolant sensor reads accurate checked for vacumn leaks with carb clean,can't fin...
April 01, 2008
1999 Ford E-250 Econoline 5.4L Surge, Stall, MIL Lamp on VIN: 1FTNE24XXH
P0171: bank 1 too lean. This van came in with a stalling and surging idle up and down. The mil is on for bank 1 and bank 2 too lean. Upstream and downstream oxygen sensors are switching from rich to lean on a scanner. checked for vacuum leak but none were found. Long term fuel trim b...
April 04, 2008
2005 Ford F-250 Super Duty XL 5.4L Hesitation, Surge, Cuts out, Misfire, MIL Lamp on VIN: 1FSW215X5E
P0171: lean exh bank 1. acts like fuel problem but pressure & volume test great in garage or on test drive wot sag surge or stumble feels like fuel starvation but is not have checked for vac leaks none found have cked o2s all good have cked fuel qaulity no problem found if anybod...
April 04, 2008
2005 Lincoln Town Car Executive L 4.6L Poor Idle Quality, Stall VIN: 1LNHM84W65
P0171: Lean Condition Bank 1. ... system found Code P0171 & P0174 - Lean condtion Bank 1 & Bank 2. Checked for vaccum leaks - none found, replaced mass air flow sensor - no luck, replaced fuel pump - no luck. PCV & Fuel Pressure Regulator are e...
April 04, 2008
2000 Dodge Ram 1500 Truck 5.9L low power VIN: 3B7KF26Z7Y
P0171: Fuel System Lean (Bank 1). ... the shop. Both o2s read normal in the service bay. I adjusted dist synch signal as it was 8 degrees advanced. The problem is when driving the truck has low power , but is better after setting the timing. It sets a p0171 code lean exhaust in the pending cod...
April 06, 2008
2000 Cadillac Eldorado ESC 4.6L MIL Lamp on VIN: 1G6EL12YXY
P0171: Fuel Trim System Lean (Bank 1). ... sure if light was on before tune up) dtc p0171&p0174. fuel pressure 36 psi koeo. changed fuel pump. Pressure from new pump the same. changed fuel pump again.(delphi).Pressure @40 psi. Checked for vacuum/intake leake,fo...
April 08, 2008
2006 Chevrolet Malibu Maxx LT 3.5L MIL Lamp on VIN: 1G1ZT63846
P0171: Fuel System Lean (Bank 1). Thank you in advance for any help you can provide. we had check fuel pressure which was good, air flow sensor, check every air hose, evap system, check for leaks on intake gasket, everything seems fine, Not quiet sure what else to check. Thank you.
April 08, 2008
1997 Dodge Stratus ES 2.5L Poor Idle Quality, Hesitation, Misfire, MIL Lamp on VIN: 1B3EJ56H4V
P0171: Fuel System Lean (Bank 1). Engine runs rough at idle and hesitates on acceleration. I tried to motorvac the vehicle but no help. Fuel pressure is good. Volume is good. Checked for vacuum leaks with smoke machine. No leaks found. I'm thinking I have partially plugged injectors. I don't r...
April 08, 2008
2003 Ford F-250 Super Duty XL 5.4L Misfire, MIL Lamp on VIN: 1FTNF21243
P0171: Lean bank 1. ... HO2S lean sensor 1-1,and a P1132 lack of HO2S rich sensor 1-1,and a P0171 lean bank 1.I know there are updated O2's that I have coming from ford.But the thing I do not get is that in my scan data is shows sensors 1-1,1-2...
April 08, 2008
1998 Honda Civic HX 1.6L Misfire, MIL Lamp on VIN: 1HGEJ7122W
P0171: Fuel System Too Lean. ... rough sometimes. found p0171 present. the fist step in diag is to check fuel pressure. disconected vacume line from reg. and pinched return line should be 38-46 is 85 then checked all conected and should be 28-36 is 45. this would cause a rich condition if...
April 09, 2008
1997 Dodge Stratus ES 2.5L Poor Idle Quality, Hesitation, Misfire, MIL Lamp on VIN: 1B3EJ56H4V
P0171: Fuel System Lean (Bank 1). Engine runs rough at idle and hesitates on acceleration. I tried to motorvac the vehicle but no help. Fuel pressure is good. Volume is good. Checked for vacuum leaks with smoke machine. No leaks found. I'm thinking I have partially plugged injectors. I don't r...
April 10, 2008
2003 Toyota Camry SE 2.4L MIL Lamp on VIN: JT2BG22K7W
P0171: Fuel System Too Lean (Bank 1). Check engine light on with codes listed above. With these codes the diagnostics is not always 100% accurate. We used to replace the air/fuel ratio sensor and MAF and that would keep the come backs to a minimum but is there a more accurate way based on Toyota t...
April 10, 2008
2002 Ford Focus SE 2.0L MIL Lamp on VIN: 1FAHP36P92
P0171: system lean. Hi everyone. Got this Focus with a system lean code (po171). Have cleaned injectors and mass ,replaced fuel filter and code still comes back. Fuel pressure is 40 psi. Speci. is 35 - 60. Seems to drive good. O2 is switching fine. Am I to low on the fuel pressur...
April 11, 2008
1998 Honda Civic HX 1.6L Misfire, MIL Lamp on VIN: 1HGEJ7122W
P0171: Fuel System Too Lean. ... rough sometimes. found p0171 present. the fist step in diag is to check fuel pressure. disconected vacume line from reg. and pinched return line should be 38-46 is 85 then checked all conected and should be 28-36 is 45. this would cause a rich condition if...
April 11, 2008
2001 Volkswagen Beetle GL 2.0L MIL Lamp on VIN: 3VWBK21C41
P0171: fuel trim lean bank 1. This car came back a second time with rich and lean condition codes. I found the mass air flow sensor was no good so replaced it a second time. Now it came back and I only found a lean running code stored in computer. Fuel trim is @ 20.1%. I cleared the code a...
April 11, 2008
1998 Volvo S70 2.4L Hesitation, Cuts out, Stall, MIL Lamp on VIN: YVLS5584W2
P0171: Fuel System Too Lean Bank 1. Hi volvo techs, i have a fault p0171 for Fuel System Too Lean (Bank 1).I inspected the intake system for leaks,re&re maf sensor inspect air intake tube for cracks)okay.i'm not sure weather the fault has occured, is there a bad maf sensor and a bad o2 senso...
April 12, 2008
1998 Volvo S70 2.4L Hesitation, Cuts out, Stall, MIL Lamp on VIN: YVLS5584W2
P0171: Fuel System Too Lean Bank 1. Hi volvo techs, i have a fault p0171 for Fuel System Too Lean (Bank 1).I inspected the intake system for leaks,re&re maf sensor inspect air intake tube for cracks)okay.i'm not sure weather the fault has occured, is there a bad maf sensor and a bad o2 senso...
April 13, 2008
2003 Ford F-150 XL 4.2L Poor Idle Quality, Hesitation, Cuts out, Stall VIN: 1FTRF17283
P0171: sys lean bank 1. new customer,starts o.k cold once hot stalls at idle idle loaps and spark knocks.replaced upper and center intake seals and bolts with only one change,set dtcs po171 po174.rechecked seals o.k.also checked balancer for damage or broken.please iatn fix my ride.....
April 14, 2008
1998 Ford Ranger Splash 2.5L MIL Lamp on VIN: 1FTYR10C2W
P0171: bank 1 lean. Bank #1 lean, replaced maf and egr tube for exhaust leak, still has light on.fuel trims and o2 looks normal. are these engins knowen for intake gaskets leaking?
April 15, 2008
2003 Ford F-150 XL 4.2L Poor Idle Quality, Hesitation, Cuts out, Stall VIN: 1FTRF17283
P0171: sys lean bank 1. new customer,starts o.k cold once hot stalls at idle idle loaps and spark knocks.replaced upper and center intake seals and bolts with only one change,set dtcs po171 po174.rechecked seals o.k.also checked balancer for damage or broken.please iatn fix my ride.....
April 15, 2008
2006 Pontiac Vibe 1.8L MIL Lamp on VIN: 5Y2SL65856
P0171: Fuel Trim System Lean. ... 10,000 mile pontiac vibe with a lean code. maf and fuel pressure read damn near perfect. vacuum is great. no drivability issues, just a mil on. p0171 lean code and fuel trims positive through the roof. smoke tested intake, no leaks. does anyone have any id...
April 15, 2008
2001 Ford Focus SE 2.0L Poor Idle Quality, Hesitation, Cuts out, Stall, MIL Lamp on VIN: 1FAFP34PX1
P0171: system to lean bank 1. this car after warm will act like fuel pressure just drops out. it will not cut off but is close. always has had code 171 in it. first thing was the oxygen sensor, still had failure @ code again after erasing it. called dealer for advice they told customer tha...
April 17, 2008
2001 Cadillac Catera 3.0L Misfire, MIL Lamp on
P0171: Fuel Trim System Lean (Bank 1). ... diagnosis. there was two codes present. p0171 and p0174 fuel pressure checked and is within spects. while checking data fuel trims are above 20 off idle at idle they are +-5. there is a tsb to adress this codes manufacturer ...
April 19, 2008
2002 Mitsubishi Eclipse GT 3.0L Poor Idle Quality, Hesitation, Surge, Cuts out, Stall, Misfire, MIL Lamp on VIN: NOVISIBLEV
P0171: Fuel System Lean (Bank 1). ... one drives me nuts for 2 days. I have this spidey in the shop originally came in with mil on had lean codes for both banks, fuel trims were over 20% at idle found lower intake manifold g-t leaking that brought short term trim to normal at idle but while dr...
April 20, 2008
1996 Mercury Mystique GS 2.0L Poor Idle Quality, Hesitation, Surge, Stall, MIL Lamp on VIN: 1MELM6531T
P0171: O2 sensor Bank indicating lean. ... started "repairs" himself by reading codes with a pocket code reader. Original codes were P0401 and P0171. Customer replaced DPFE sensor to repair P0401 and replaced O2 sensor to repair P0171. Of course the O2 sensor wasnt the problem so he added...
April 21, 2008
1998 Pontiac Grand Prix GTP 3.8L MIL Lamp on VIN: 1G2WP5216W
P0171: Fuel System Lean (Bank 1). ... Replace ac compressor. Came back 2 days later with a p0171 code. Scanned data and found the o2 sensor not moving. LT fuel trim was +16. Replaced o2 sensor and cleared code. Light came right back on. LT is still +16. Checked for vacuum leaks with gum cutter...
April 22, 2008
1997 Ford F-150 4.6L MIL Lamp on, Lean
P0171: Sys Bank 1 lean. Other master tech in shop has been fighting codes for 5 weeks, now I'm taking a look at it for him what I've seen for the last 3 day's is that the fuel trim (long) is at B1 24-26% B2 is at 14-17% at idle baro is at 133-138mhz spec in denver is 144mhz baro is r...
April 30, 2008