P0171 Diagnostic Trouble Code Discussion for January 2006
Fuel System Lean (Bank 1)
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| Help Request | Posted | |
| 1998 Ford F-150 Lariat 4.6L MIL Lamp on VIN: 1FTZX18W3W P0171: system leak bank 1. after driving for about 20-25 min.[25 miles]it will set both codes at just about the same time.using scan tool we can not pick up on anything,all appears normal.the only thing we can see is the baro is about 137-140 hz.we are about 1200 feet and we think it sh... |
January 02, 2006 | |
| 2002 Buick Rendezvous CX 3.4L MIL Lamp on VIN: 3G5DA03E22 P0171: Fuel Trim System Lean (Bank 1). This vehicle came in with no running problems. It also has Codes U1000 and B1000. Only problem is that SERVICE VEHICLE SOON light is on and the remote won't lock or unlock the doors. Light came on and remote quit working at the same time. Vehicle has a couple ... |
January 05, 2006 | |
| 1997 Ford F-350 7.5L MIL Lamp on VIN: 3FEKF37GXV P0171: system too lean bank 1. Vehicle came in with check engine light on and codes stored in computer. I replaced Maf sensor but still had high short fuel trim numbers. Checked scanner and noticed when air PID changed to Atmosphere from upstream, that air was still going downstream to the ... |
January 05, 2006 | |
| 1994 Ford Thunderbird LX 4.6L Excessive Emissions VIN: 1FALP62W0R P0171: lean air/fuel bank1. ... light was on. code scan revealed P0171/P0174 (LEAN air/fuel ratio bank 1&2) and P0402 (Excessive egr flow) MAF Baro was 126 Hz. our normal range in chicago is 156 to 159 Hz. We replaced MAF, EGR, EVR, DPFE, and both upst... |
January 06, 2006 | |
| 1997 Ford Explorer XL 4.0L MIL Lamp on, erroneous data VIN: 1FMDU34X8V P0171: system lean bank 1. Has anyone run into this problem other than me? the vehicle came in with the mil on and no drivability complaint. the codes were po171 and po174, bank 1 and 2 lean, the snapshot showed reasonably centered fuel trim(long and short term)and the baro on manfact... |
January 06, 2006 | |
| 2000 Chrysler Sebring LXi 2.5L MIL Lamp on VIN: 4C3AU52N8Y P0171: Fuel System Lean (Bank 1). This is a Mitsu 2.5 v/6. Car has a front bank long term adaptive pegged at 24.8 Rear bank is fine. The pulse width of the front is 3.2 and rear 2.6. We can force the adaptive down by adding fuel. If we reset adaptives the car will idle rough for a few seconds ... |
January 09, 2006 | |
| 2002 Chevrolet Tahoe LS 5.3L Excessive Emissions, Poor Idle Quality, Misfire, MIL Lamp on VIN: 1GNEK13Z72 P0171: Fuel Trim System Lean (Bank 1). hello this 02 tahoe is a flex fuel truck ,it came to us running very rough and blowing black smoke . I pulled codes and it had the codes ,I posted up top 1,3 5 7 cyl mis all on bank 1 .We did a smoke test for intake leak none found , checked fuel pressure seem... |
January 10, 2006 | |
| 1997 Ford F-350 7.5L MIL Lamp on VIN: 3FEKF37GXV P0171: system too lean bank 1. Vehicle came in with check engine light on and codes stored in computer. I replaced Maf sensor but still had high short fuel trim numbers. Checked scanner and noticed when air PID changed to Atmosphere from upstream, that air was still going downstream to the ... |
January 10, 2006 | |
| 1998 Ford Explorer XL 4.0L MIL Lamp on VIN: 1FMZU34X9W P0171: lean bank 1. ... This one keeps setting P0171. The freeze frame data shows LT TRIM B1% 19.5, also LT TRIM B2% 17.2. One week ago we replaced the upper intake o-rings and reset KAM at the same time, trims looked good then. The B2 trim is high to but hasn't set code yet, sur... |
January 10, 2006 | |
| 2002 Lincoln Continental 4.6L Surge, Poor Fuel Economy, MIL Lamp on, Lean Condition VIN: 1LNHM97V32 P0171: Lean Exhaust Bank 1. ... Checked codes: P0171 & P0174 (banks 1 and 2, system lean). Snap-On scanner confirmed extremely lean condition taking place. TSB 04-17-4 addresses these codes (and other codes) as relating to a vacuum leak. We have smoked the engine as well as changed t... |
January 10, 2006 | |
| 2002 Mercedes-Benz C230 Kompressor 2.3L MIL Lamp on VIN: WDBRN47J82 P0171: testing and results. I am having difficulty repairing a p0171 reoccuring code and have limited info available to me. I have verified no air leaks,replaced maf sensor & air filter, not sure about fuel pressure specs, can someone please guide me on fuel pressure & regulator ... |
January 10, 2006 | |
| 1999 Chevrolet Silverado 1500 5.3L MIL Lamp on VIN: 2GCEK19TXX P0171: Fuel Trim System Lean (Bank 1). Thanks in advance for your time. This truck came in with MIL on. Was running OK. It had lean codes, both banks. Test drive was OK. Long term fuel trim +25 both banks. IAC counts very low. Tested fuel system. Pressure OK, flow poor, waveform on pump motor very ... |
January 11, 2006 | |
| 1995 Mercury Grand Marquis LS 4.6L MIL Lamp on VIN: 2MELM75W1S P0171: System Too Lean Bank 1. Hello all I have this car that has been to us twice now with the same codes. Car has no drivibility problems other than light is on. First time it took over two weeks of daily driving to come on again and second time was a little less. We have been unable to l... |
January 12, 2006 | |
| 1997 Pontiac Grand Prix GTP 3.8L MIL Lamp on VIN: 1G2WP1212V P0171: Fuel System Lean (Bank 1). 97 gran prix,supercharged.came in with check engine light.found missfire and lean bank 1 codes-checked for external vacuum leaks,none noted.stft was at 4-8% and ltft at 16% at idle.checked with smoke machine,found crankcase filling with smoke.replaced intake g... |
January 12, 2006 | |
| 2002 Volkswagen Jetta GLS 1.8L MIL Lamp on VIN: 3VWSE69M22 P0171: Bank 1 fuel measuring system system too lean. ... engine lite code was P0171 bank 1 system too lean it turn out to be a vacuum leak coming off the cylinder block breather vacuum hose located underneath the intake. A week later cars back with the same code P0171. I double check my work only to find nothing... |
January 12, 2006 | |
| 2000 Land Rover Discovery Series II 4.0L Hesitation VIN: SALTY1249Y P0171: system lean B-1. ... I'm not a Land Rover tech, just trying to keep a customer from having to drive 3 hrs + to the dealer. This rig acts just like it has low fuel pressure/volume. Its real cold natured, no power and backfires on snap throttle. It runs great at hot idle and rea... |
January 14, 2006 | |
| 2000 Ford E-250 Econoline 5.4L MIL Lamp on ... a P0172 P0175 P0302. The Baro reading was 142hrtz ( normal here is 154hrtz ) Fuel pressure was high and #2 injector screen was clogged. I removed and cleaned all injectors screen, replaced fuel pressure regulator, fuel fi... |
January 15, 2006 | |
| 2004 Ford E-250 5.4L MIL Lamp on P0171: bank1 lean. hello group, sorry about no vin, this pretains to a fleet of 2004 e-250 vans with a mil with always the same codes on on every model. fuel trim short and long term look ok, fuel pressure is ok, no vac leaks found. vans run good just mil on. i tried a maf on on... |
January 15, 2006 | |
| 1999 Ford Contour LX 2.5L Stall, MIL Lamp on VIN: 1MEFM66L6X P0171: fuel sys. lean. MORE INFO AT IDLE WHEN WARMED UP ENG SPD. 805RPM COOL TEMP. 98 C CLSD. LOOP AIR INTAKE TEMP 10 C MAF 3.48gm/s THROTTLE ANGLE 17.6% VEH. SPD. 0KM/H LTFT BANK 1 6.25% STFT BANK 1 0.00% O2 B1S1 265 MV O2 B1S2 85 MV LTFT BANK 2 25.00% STFT BANK 2 +32.81% O2 B2S1 ... |
January 19, 2006 | |
| 1997 Ford E-250 Econoline XL 4.2L Poor Idle Quality, Hesitation, Surge, Stall, MIL Lamp on VIN: 1FTFE242DV ... stalling at times when at a stop as well as when they were to excel it would stumble. There were no codes set at this time. When we removed the air filter the engine would start to stumble. We replaced the MAF sensor because of that. This didnt fix it. We ... |
January 20, 2006 | |
| 1999 Ford Explorer XL 4.0L Poor Idle Quality, MIL Lamp on VIN: 1FMZU32X4X P0171: lean bank 1. This explorer belongs to a mail lady, she has the country route so she mainly idles all day, from mail box to mail box. Her main complaint is that the truck dies from time to time but it will start right back up, and engine light on. When I tuned up I noticed ... |
January 20, 2006 | |
| 1999 Ford Explorer XL 4.0L Poor Idle Quality, MIL Lamp on VIN: 1FMZU32X4X P0171: lean bank 1. This explorer belongs to a mail lady, she has the country route so she mainly idles all day, from mail box to mail box. Her main complaint is that the truck dies from time to time but it will start right back up, and engine light on. When I tuned up I noticed ... |
January 23, 2006 | |
| 1996 Geo Tracker 1.6L MIL Lamp on VIN: 2CNBE1860T P0171: Fuel Trim System Lean (Bank 1). Tracker bought at auction. Initially had multiple codes. Did not write them down, before clearing ( I rememeber the TCC code and an EGR code being present). TCC code came up at first drive. Replaced solenoid and code did not come back. The following monitors a... |
January 23, 2006 | |
| 1997 Dodge Neon High Line 2.0L MIL Lamp on VIN: 1B3ES47C9V P0171: Fuel System Lean (Bank 1). long term fuel adapt. at -24.5 % , when i try to erase / reset fuel adapts. they won,t as soon as i start car scanner reads long term as -24.5. have checked cam/crank timing, fuel pressure test, coolant sensor & t.p.s. all good, map sensor reads the sam as... |
January 24, 2006 | |
| 1999 Ford Ranger XL 3.0L Hesitation, Surge, MIL Lamp on VIN: 1FTYR10V2X P0171: bank 1 system lean. 1ST DISPATCHED; WAS TO SCAN CEL. DATA/CODES. THIS IS A FLEX FUEL 2WD RANGER.I SEE OVER $750.00 IN PARTS HAVE BEEN THROWN AT THIS BY SEVERAL LOCAL SHOPS. O.K. I LOVE A CHALLENGE. 5 HOURS,I'M STUMPED.I MUST BE OVERLOOKING SOMETHING BASIC. ??? FUEL TRIM #'s ARE T... |
January 24, 2006 | |
| 1999 Toyota Solara SE 3.0L MIL Lamp on VIN: 2T1CF22P9X P0171: System to lean. Good evening fellow techs looking for some help on this one thought it was going to be an easy repair. Orginnally came in with MIL light on lean exhaust found vacuum leak near intake manifold easy repair. Car came back 2 days later with MIL light back on now w... |
January 24, 2006 | |
| 1997 Ford Expedition XLT 5.4L MIL Lamp on VIN: 1FMFV18L4V P0171: systen lean bank 1. will not get code when at idle,only at 1500 rpm or higher/runs ok /no vacuum leaks |
January 25, 2006 | |
| 1997 GMC K2500 Sierra SL 5.7L MIL Lamp on VIN: 1TGEK19R4W P0171: Fuel Trim System Lean (Bank 1). Have installed lpg system .Drives good for a week or so with service engine soon light on until it gets enough codes and then goes into limp mode.Have fitted emulators to o2 sensors. I have tried everything i can think of to stop this occuring. It is only when... |
January 25, 2006 | |
| 1999 Ford Contour LX 2.5L Stall, MIL Lamp on VIN: 1MEFM66L6X P0171: fuel sys. lean. MORE INFO AT IDLE WHEN WARMED UP ENG SPD. 805RPM COOL TEMP. 98 C CLSD. LOOP AIR INTAKE TEMP 10 C MAF 3.48gm/s THROTTLE ANGLE 17.6% VEH. SPD. 0KM/H LTFT BANK 1 6.25% STFT BANK 1 0.00% O2 B1S1 265 MV O2 B1S2 85 MV LTFT BANK 2 25.00% STFT BANK 2 +32.81% O2 B2S1 ... |
January 26, 2006 | |
| 2001 Hyundai Sonata 2.4L MIL Lamp on VIN: KMHWF25S1A P0171: Fuel System Too Lean (Bank 1). ... Sonata,2.4L 4cyl, automatic. The code is a P0171,lean exhaust bank 1. LTFT is 16.4% Replaced the fuel filter,regulated fuel pressure at idle is 41 PSI and about 47 PSI unregulated. Could not get fuel pump volume specs or code info from Mitchell or SOLUS. O... |
January 26, 2006 | |
| 1999 Toyota 4Runner Limited 3.4L MIL Lamp on VIN: JT3HN87R1X P0171: Fuel System Too Lean (Bank 1). THIS VEHICLE CAME IN WITH A PO171 SYSTEM LEAN WE CLEANED MAF AND THROTTLE BODY SMOKE TESTED MANIFOLD ALL CHECKS OUT GOOD. DATA ON SCANNER LOOKS GOOD EXCEPT BANK 1 SENSOR 1 O2 SENSOR NOT MOVING STAYING AT 660 mV REPLACE O2 SENSOR STILL SAME PO171 RUNS GREAT NO ... |
January 26, 2006 | |
| 2000 Ford Explorer Eddie Bauer 4.0L Poor Fuel Economy, MIL Lamp on VIN: 1FMZU64E8Y P0171: lean. ... Customer comes in and requests to have a tune up and brake check. Customer had no complaints about performance. We did plugs, wires,pcv and filters. Customer returns two weeks later with poor gas mileage complaint and check engine light on. Pull codes P017... |
January 27, 2006 | |
| 1997 GMC K2500 Sierra SL 5.7L MIL Lamp on VIN: 1TGEK19R4W P0171: Fuel Trim System Lean (Bank 1). Have installed lpg system .Drives good for a week or so with service engine soon light on until it gets enough codes and then goes into limp mode.Have fitted emulators to o2 sensors. I have tried everything i can think of to stop this occuring. It is only when... |
January 30, 2006 | |
| 2000 Ford E-250 Econoline 5.4L MIL Lamp on ... a P0172 P0175 P0302. The Baro reading was 142hrtz ( normal here is 154hrtz ) Fuel pressure was high and #2 injector screen was clogged. I removed and cleaned all injectors screen, replaced fuel pressure regulator, fuel fi... |
January 31, 2006 | |
| 2004 Land Rover Discovery SE 4.6L Misfire, Low Power VIN: SALTY19424 P0171: Bank 1 Too Lean. Hi! This isn't for me, but a friend of mine. This Discovery will fall on it's face at random times. Full throttle... Light Throttle doesn't matter. We're talking like nothing. It's unsafe when it happens, it acually will stop accelerating. The dealer can't g... |
January 31, 2006 | |
| 1998 Volkswagen Beetle 2.0L MIL Lamp on VIN: 3VWBB61C6W P0171: bank 1 system running lean. ... the check engine light was on. The trouble code was p1543, p1544, p1558, p1565, and p1580. Then I replace throttle actutor assembly. The customer took back the car for two weeks and then came back. He complained that the check engine light was still on. Th... |
January 31, 2006 |
