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P0171 Diagnostic Trouble Code Discussion for March 2008

Fuel System Lean (Bank 1)


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Trouble Ticket Help Requests for DTC P0171
Help Request Posted
2000 Nissan Altima GLE 2.4L No Start VIN: 1N4DL01D6Y
P0171: Fuel Trim Lean (Bank 1). ... light and a vibration at idle. During the test drive the check engine light was out, the power was good and there was no vibration. When we hooked the scanner up (OTC Genisys with the Smart Cable and 2006 Import Software) there was no communication with t...
March 04, 2008
1998 Ford Ranger Splash 4.0L MIL Lamp on, P0171 & P0174 VIN: 1FTYR14X2W
P0171: Air fuel ratio too lean bank 1. After replacement of MAF & bank 2 O2 sensor, MIL returns same codes after 2nd drive cycle. PCV valve, dip stick, vacuum hoses, EGR valve all seem to be okay. No exhaust leaks. No knowledge of vapor management system, no test procedures available. Customer ...
March 05, 2008
2001 Chevrolet Silverado 1500 4.8L MIL Lamp on VIN: 1GCEK19V01
P0171: Fuel Trim System Lean (Bank 1). checked for vaccum leaks none found,fuel pressure in specs,o2 sensors working fine,this truck will have a pre ignition rattle on slight incline ,however if runing premium gas it will not do it,
March 06, 2008
2001 Chevrolet Silverado 1500 4.8L MIL Lamp on VIN: 1GCEK19V01
P0171: Fuel Trim System Lean (Bank 1). checked for vaccum leaks none found,fuel pressure in specs,o2 sensors working fine,this truck will have a pre ignition rattle on slight incline ,however if runing premium gas it will not do it,
March 11, 2008
1998 Ford E-350 Econoline XL 5.4L MIL Lamp on VIN: 1FDWE37L4W
P0171: System too lean bank 1. ... light on and P0171, P0174 were on memory. Live data was showing LFT -5 B1, LFT -3 B2, SFT -4 B1, SFT -2 or -3 B2, MAF 156 Hz, temp 195 the O2 were switching good. I smoked the engine and the only leak found was at the EGR ...
March 11, 2008
2000 Lexus RX300 3.0L MIL Lamp on VIN: JT6GF10V9Y
P0171: system too lean. when this vehicle came in the first time about 2 months ago came in with 2 codes po171 and po172, we replaced the two a/f sensors two wheeks later came back with only po171 system to lean we performanced carbon clean by puting pressure to injectors whit a snap...
March 11, 2008
1999 Toyota 4Runner SR5 3.4L Hesitation, Misfire, MIL Lamp on VIN: JT3GN86R7X
P0171: Fuel System Too Lean (Bank 1). Me and a few others at work are stuck. This 4runner came in a week ago before a trip and it had a lean code on B2. Could not find a vacuum leak anywhere. Suggested an induction service but she didn't have time so we just cleared the code and let her go. Today ...
March 20, 2008
1998 Ford Taurus SE Comfort 3.0L Poor Fuel Economy VIN: 1FAFP53S6W
P0171: lean bank 1. ... has been getting poor mileage for last year. Egr code set first and he replaced it. code did not return but after another couple months P0171 and 174 started coming up, so he replaces the front O2 sensors After about every...
March 21, 2008
1999 Honda Odyssey EX 3.5L MIL Lamp on VIN: 2HKRL1868X
P0171: Fuel System Too Lean (Bank 1). the flow chart tells us to check valve clearance 4.6 hrs, if ok replace injectors. this doesn't make sense to us! and customer doesn't want to pay for 4.6 hrs with out a guarantee much less 6 injectors! has anybody run ito this before?
March 24, 2008
1999 Ford Ranger XL 3.0L MIL Lamp on VIN: 1FTZR15V11
P0171: lean. truck came in for service light. scaned system po171 and po174, bank 1 lean and bank 2 lean. idle in park is about 900. this is a metal intake, have replaced m.a.f., same problem.clear codes test drive 15 miles no light, let set about 10 min. and drive will re...
March 30, 2008
1998 Pontiac Bonneville SE 3.8L MIL Lamp on VIN: 1G2HX52K4W
P0171: Fuel System Lean. ... kicking my butt and i'm not giving up even if i have to buy it. Came in with a p0171 logged.Of course it has only one upstream o2 so the whole engine could be lean. After a visual inspection i found the vacuum line going to the fuel pressure reg/purge valv...
March 30, 2008
2003 Jaguar S-Type 4.2L MIL Lamp on VIN: SAJGAQ3V63
P0171: lean - bank 1. Hello This supercharged S type R is setting lean codes for both banks. Car is very clean. LTFT 1s about 17 to 19%. STFT is always near 0%. It is easy to see that under high load fuel supply is ok. Both O2 sensors above 900mV. Very nice performance. Probl...
March 31, 2008
2000 Nissan Altima GLE 2.4L No Start VIN: 1N4DL01D6Y
P0171: Fuel Trim Lean (Bank 1). ... light and a vibration at idle. During the test drive the check engine light was out, the power was good and there was no vibration. When we hooked the scanner up (OTC Genisys with the Smart Cable and 2006 Import Software) there was no communication with t...
March 04, 2008
1998 Ford Ranger Splash 4.0L MIL Lamp on, P0171 & P0174 VIN: 1FTYR14X2W
P0171: Air fuel ratio too lean bank 1. After replacement of MAF & bank 2 O2 sensor, MIL returns same codes after 2nd drive cycle. PCV valve, dip stick, vacuum hoses, EGR valve all seem to be okay. No exhaust leaks. No knowledge of vapor management system, no test procedures available. Customer ...
March 05, 2008
2001 Chevrolet Silverado 1500 4.8L MIL Lamp on VIN: 1GCEK19V01
P0171: Fuel Trim System Lean (Bank 1). checked for vaccum leaks none found,fuel pressure in specs,o2 sensors working fine,this truck will have a pre ignition rattle on slight incline ,however if runing premium gas it will not do it,
March 06, 2008
2001 Chevrolet Silverado 1500 4.8L MIL Lamp on VIN: 1GCEK19V01
P0171: Fuel Trim System Lean (Bank 1). checked for vaccum leaks none found,fuel pressure in specs,o2 sensors working fine,this truck will have a pre ignition rattle on slight incline ,however if runing premium gas it will not do it,
March 11, 2008
1998 Ford E-350 Econoline XL 5.4L MIL Lamp on VIN: 1FDWE37L4W
P0171: System too lean bank 1. ... light on and P0171, P0174 were on memory. Live data was showing LFT -5 B1, LFT -3 B2, SFT -4 B1, SFT -2 or -3 B2, MAF 156 Hz, temp 195 the O2 were switching good. I smoked the engine and the only leak found was at the EGR ...
March 11, 2008
2000 Lexus RX300 3.0L MIL Lamp on VIN: JT6GF10V9Y
P0171: system too lean. when this vehicle came in the first time about 2 months ago came in with 2 codes po171 and po172, we replaced the two a/f sensors two wheeks later came back with only po171 system to lean we performanced carbon clean by puting pressure to injectors whit a snap...
March 11, 2008
1999 Toyota 4Runner SR5 3.4L Hesitation, Misfire, MIL Lamp on VIN: JT3GN86R7X
P0171: Fuel System Too Lean (Bank 1). Me and a few others at work are stuck. This 4runner came in a week ago before a trip and it had a lean code on B2. Could not find a vacuum leak anywhere. Suggested an induction service but she didn't have time so we just cleared the code and let her go. Today ...
March 20, 2008
1998 Ford Taurus SE Comfort 3.0L Poor Fuel Economy VIN: 1FAFP53S6W
P0171: lean bank 1. ... has been getting poor mileage for last year. Egr code set first and he replaced it. code did not return but after another couple months P0171 and 174 started coming up, so he replaces the front O2 sensors After about every...
March 21, 2008
1999 Honda Odyssey EX 3.5L MIL Lamp on VIN: 2HKRL1868X
P0171: Fuel System Too Lean (Bank 1). the flow chart tells us to check valve clearance 4.6 hrs, if ok replace injectors. this doesn't make sense to us! and customer doesn't want to pay for 4.6 hrs with out a guarantee much less 6 injectors! has anybody run ito this before?
March 24, 2008
1999 Ford Ranger XL 3.0L MIL Lamp on VIN: 1FTZR15V11
P0171: lean. truck came in for service light. scaned system po171 and po174, bank 1 lean and bank 2 lean. idle in park is about 900. this is a metal intake, have replaced m.a.f., same problem.clear codes test drive 15 miles no light, let set about 10 min. and drive will re...
March 30, 2008
1998 Pontiac Bonneville SE 3.8L MIL Lamp on VIN: 1G2HX52K4W
P0171: Fuel System Lean. ... kicking my butt and i'm not giving up even if i have to buy it. Came in with a p0171 logged.Of course it has only one upstream o2 so the whole engine could be lean. After a visual inspection i found the vacuum line going to the fuel pressure reg/purge valv...
March 30, 2008
2003 Jaguar S-Type 4.2L MIL Lamp on VIN: SAJGAQ3V63
P0171: lean - bank 1. Hello This supercharged S type R is setting lean codes for both banks. Car is very clean. LTFT 1s about 17 to 19%. STFT is always near 0%. It is easy to see that under high load fuel supply is ok. Both O2 sensors above 900mV. Very nice performance. Probl...
March 31, 2008