Question about 1998 Buick LeSabre

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P0171 Code (Lean Fuel Bank 1) Engine light on

Car runs fine other than a slight hesitation on acceleration. P0171 Code still exists after replacing fuel filter and gas cap. Also, checked air intake for any leaks to permit to much air into system. At a loss what to check or do next?

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  • kagion Nov 27, 2008

    Found a couple places where there was a vacuum leak. Repaired those places and the hesitation on acceleration went away. The system lean fault still persisted. Broke down and replaced the o2 sensor. The fault is still showing up but seems to be intermittent now. I am unable to test fuel pressure or vacuum pressure and at a loss as to what else to do other than run it into a garage for repair.

  • tingle01 Jan 27, 2009

    I am having the same problem. Engine light keeps coming on showing a p0171 code on a 2001 ford focus. I have replaced fuel filter. Had my fuel injectors cleaned as well as changing spark plugs and wires. I have replaced oxygen sensor before cataletic converter. Do not know what else to do. Please help

  • Anonymous Mar 14, 2014

    2004 trailblazer was sitting in driveway for 3 months with gas leek. replaced fuel pump leek vent away now the vehicle is fluttering with code p0300 randim missfire and p0171 running lean?

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You nead to check all you vacuum lines for leaks it sounds like you have a vacuum leak or the o2 sensor is going bad on bank 1 **** i still say vacuum leak

Posted on Nov 23, 2008

  • You need to double check for vacuum leaks. Get a can of carb cleaner, and with engine running spray around any vacuum hoses, when the idle picks up, that's where the leak is. Listen really good for a sucking noise, also.

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PO 171 indicates a lean condition in bank 1 or the same side of the engine as the first cylinder , usually it is caused by a vacuum leak some where check to make sure that even the smallest of vacuum hoses are in good condition and not leaking

Posted on Dec 05, 2008

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Po171 is your mass air flow sensor. An expensive part but worth the money

Posted on Mar 02, 2009

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Thank you. Checking for additional vacuum leak with the carb cleaner was great. Found one other vacuum leak with a pinched o-ring. P0171 code has cleared.

Thanks again.

Posted on Dec 01, 2008

  • Michael Maczuga
    Michael Maczuga Feb 09, 2011

    where was the o ring that you found pinched? and did the code come back
    at all because I am having the same problem

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YES I SOLVED THIS!

There is a recall in ford focuses for the fuel pump. If anyone goes to the Ford dealership and complains about acceleration, hesitation, or stalling will get a new fuel pump with models after 2000. P0171 is the trouble code for this, it means that the pistons aren't getting enough of fuel versus air.

Posted on Mar 22, 2009

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  • Alex5853 Apr 29, 2011

    Had P0171 message on my car. Car kept running but wasn't very happy. Checked fuel pump, replaced fuel filter, checked sensors, checked vacuum, everything turned out to be ok.
    Just accidentally we noticed one vacuum tube at the rear of the engine being sucked flat. It came in its normal form when the engine was shut off.
    Replaced the tube and the engine ran smooth again. OBDII gave normal readings on fuel trim again. Took me weeks to find out.

  • drnathansmit Apr 29, 2011

    Mine is a 2002 focus ZX5, I am having the same issue. Where exactly was that hose you found that was kinked when the engine was running?

  • Howard Kalnas
    Howard Kalnas Apr 18, 2013

    I read your post about the recall and was relieved. Then I tried a search of the recall on an 03 focus. I found NO mention anywhere. I then called a Ford dealer and he checked and No Record of any recalls of fuel pumps for that year or any other. He even ran my VIN. I checked my PCV hose, checked my DPFE sensor, my EGR VALVE Vacuum Solenoid, my EGR VALVE. All are working properly! I've been spraying Carb Cleaner all around and cannot find any air leaks. I took my MAF sensor out and clened the heck out of it. All made no differance. Unfortunately there is no way to "check" a MAF sensor. I hate to buy something without being sure, but i just might.

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Just an off the wall, out of the box thought. Possibly the intake manifold plenum has cracked allowing more air to enter the combustion chamber causing the "vacuum leak" symptom of a lean condition. Often times, a leaking plenum will exhibit symptoms similar to a blown head gasket, such as misfire in the morning with plumes of water vapor and a noticeable decrease in water volume in the reservoir. Bank 1 indicates the O2 sensors location in the system. Bank 1 is the O2 Sensor just before the bend to the catalytic converter and Bank 2 is positioned right after the cat.

Posted on Feb 09, 2015

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What are your fuel trims reading on both banks that is the best way to diagnose lean conditions if fuel trims are jumping around you deffinetly have vacumn leak after mass air flow sensor

Posted on Feb 12, 2015

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Im getting P0171 code- lean .


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Jan 27, 2016 | Cars & Trucks

3 Answers

Code p0171 and p0174


P0171 possible cheap fix

Feb 21, 2015 | 2002 GMC Sierra 1500

1 Answer

Engine light on


P0171 ; Fuel Trim System Lean (Bank 1)
P0174; Fuel Trim too Lean (Bank 2)
fuel trim is system to modify injector pulse if system go lean it will go rich when the system is too much lean and is max.rich it code
look for 02 sensor bank 1 and 2 data
hope it helps

Mar 31, 2014 | 2003 Chevrolet Malibu

1 Answer

2001 nissan sentra 1.8L 4cyl. running codes P0105:P1605:P0171:P0325... engine idles fine when in park just not in gear, in gear it shakes pretty bad, also hesitates to accelerate when you press on gas...


code po105 refers to manifold absolute pressure(MAP)sensor/barometric pressure (BHARO) sensor -circuit malfunction==causes--wiring MAP sensor--BARO sensor--ECM
code p0171 refers to system to lean bank 1===causes intake/exhaust leak---AIR system MAF/MAP sensor fuel pressure /pump /injectors--HO2SW
code p0325 refers to knock sensor(KS) 1 bank 1-circuit malfunction====causes--wiring ---poor connections---KS
Check the exhaust flexible pipe at the manifold for cracks
have a fuel pressure test done on the fuel manifold to determine either pump/ filter or pressure regulator.
replace HO2S unit

Sep 21, 2013 | Cars & Trucks

1 Answer

Rough idle vibrates and po171 code service engine soon. jamesrowland9@aol.com


Hi, a Ford P0171 is a LEAN code for cylinder bank 1, and P0174 is a LEAN code for cylinder bank 2. These codes commonly occur on many Ford vehicles, and are set when the powertrain control module (PCM) sees the air/fuel mixture is running too lean (too much air, not enough fuel).
When the Check Engine Light comes on, either one of these codes, or both, may be found when a code reader or scan tool is plugged into the vehicle diagnostic connector. IF the vehicle is driven long enough, typically both codes will be set.
A P0171 lean code for bank 1 is the cylinder bank on the RIGHT (passenger) side of the engine on Ford vehicles with a V6 or V8 engine and rear-wheel drive.


A lean fuel condition may exist if the engine is sucking in too much air and/or the fuel system is not delivering enough fuel. If bad enough, a lean fuel condition may cause lean misfire, a rough idle, hesitation or stumble when accelerating, and/or poor engine performance.
Unmetered air can enter the engine through a vacuum leak, a dirty airflow sensor that is not reading airflow accurately, an EGR valve is not closing and is leaking exhaust into the intake manifold, an EGR valve that is allowing too much flow (because the EGR differential pressure sensor that monitors EGR flow is faulty and is under-reporting EGR flow).
If the problem is not enough fuel, the underling cause may be a weak fuel pump, restricted fuel filter, leaky fuel pressure regulator or dirty fuel injectors.

Mar 24, 2011 | Ford Escort Cars & Trucks

1 Answer

2003 Corolla P0171 code check engine light on slightly rough


P0171 - System Too Lean (Bank 1)
Basically this means that an oxygen sensor in bank 1 detected a lean condition (too much oxygen in the exhaust). On V6/V8/V10 engines, Bank 1 is the side of the engine that has cylinder #1.

Note: This DTC is very similar to P0174, and in fact your vehicle may show both codes at the same time.

Symptoms: You will more than likely not notice any drivability problems, although there may be symptoms such as a lack of power, detonation (spark knock), and/or a hesitation/surge on acceleration.

Causes: A code P0171 may mean that one or more of the following has happened:
* The MAF (Mass Air Flow) Sensor is dirty or faulty. Note: The use of "oiled" air filters may cause the MAF to become dirty if the filter is over-oiled. There is also an issue with some vehicles where the MAF sensors leak the silicone potting material used to protect the circuitry.
* There could be a vacuum leak downstream of the MAF sensor.

Possible solutions include:
* In the vast majority of cases, simply cleaning the MAF sensor does the trick. Consult your service manual for it's location if you need help. I find it's best to take it off and spray it with electronics cleaner or brake cleaner. Make sure you are careful not to damage the MAF sensor, and make sure it's dry before reinstalling
* Inspect all vacuum and PCV hoses, replace if necessary
* Check for a dirty fuel filter and proper fuel pressure


Hope this helps (remember to rate this answer).

Dec 08, 2010 | 2003 Toyota Corolla

1 Answer

Engine light coming on. Code reader says "too


P0171 - System Too Lean (Bank 1)
Basically this means that an oxygen sensor in bank 1 detected a lean condition (too much oxygen in the exhaust). On V6/V8/V10 engines, Bank 1 is the side of the engine that has cylinder #1.

Note: This DTC is very similar to P0174, and in fact your vehicle may show both codes at the same time.

Symptoms: You will more than likely not notice any drivability problems, although there may be symptoms such as a lack of power, detonation (spark knock), and/or a hesitation/surge on acceleration.

Causes: A code P0171 may mean that one or more of the following has happened:
* The MAF (Mass Air Flow) Sensor is dirty or faulty. Note: The use of "oiled" air filters may cause the MAF to become dirty if the filter is over-oiled. There is also an issue with some vehicles where the MAF sensors leak the silicone potting material used to protect the circuitry.
* There could be a vacuum leak downstream of the MAF sensor.

Possible solutions include::
* In the vast majority of cases, simply cleaning the MAF sensor does the trick. Consult your service manual for it's location if you need help. I find it's best to take it off and spray it with electronics cleaner or brake cleaner. Make sure you are careful not to damage the MAF sensor, and make sure it's dry before reinstalling
* Inspect all vacuum and PCV hoses, replace if necessary
* Check for a dirty fuel filter and proper fuel pressure


Hope helps (remember to rate this).

Nov 09, 2010 | 2001 Mazda Protege

3 Answers

2000 jeep cherakee throwing p0171


P0171 OBD-II Trouble Code Technical Description System Too Lean (Bank 1)

What does that mean? Basically this means that an oxygen sensor in bank 1 detected a lean condition (too much oxygen in the exhaust). On V6/V8/V10 engines, Bank 1 is the side of the engine that has cylinder #1.
Note: This DTC is very similar to P0174 and in fact your vehicle may show both codes at the same time.

Symptoms You will more than likely not notice any drivability problems, although there may be symptoms such as a lack of power, detonation (spark knock), and/or a hesitation/surge on acceleration.

Causes A code P0171 may mean that one or more of the following has happened:
  • The MAF (Mass Air Flow) Sensor is dirty or faulty. Note: The use of "oiled" air filters may cause the MAF to become dirty if the filter is over-oiled. There is also an issue with some vehicles where the MAF sensors leak the silicone potting material used to protect the circuitry.
  • There could be a vacuum leak downstream of the MAF sensor.

Possible Solutions Possible solutions include:
  • In the vast majority of cases, simply cleaning the MAF sensor does the trick. Consult your service manual for it's location if you need help. I find it's best to take it off and spray it with electronics cleaner or brake cleaner. Make sure you are careful not to damage the MAF sensor, and make sure it's dry before reinstalling
  • Inspect all vacuum and PCV hoses, replace if necessary
  • Check for a dirty fuel filter and proper fuel pressure

Hope this help.

Apr 28, 2010 | 2000 Jeep Cherokee

1 Answer

Cavalier blowing out black smoke car idles fairly well considerin


Black smoke is usually unburned fuel. P0171 reads bank 1 system too lean. There isn't one answer. You need to dig further and inspect your cars fuel system, from the pump to the injectors. Because of the mileage you may want to start off with a compression test just to see where you stand with the motor. write back if you have any other questions.

Apr 24, 2009 | 1999 Dodge Intrepid

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