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P0171 code wont go away

Discussion in '1st Gen. Tacomas (1995-2004)' started by tmantstud, Sep 29, 2009.

  1. Sep 29, 2009 at 3:18 PM
    #1
    tmantstud

    tmantstud [OP] High Mileage Work

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    My truck has been throwing a P0171 code for awhile now. I have replaced the front and rear o2 sensors, cleaned the MAF and checked for exhaust leaks but it still returns even after resetting the computer and having it cleared at auto stores. Any other suggestions? :confused:
     
  2. Sep 29, 2009 at 3:20 PM
    #2
    Brunes

    Brunes abides.

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    I think that is a System To Lean condition- So fuel system (injectors, rails, etc) would be next imo....but I'm no pro...
     
  3. Sep 29, 2009 at 3:25 PM
    #3
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Moderator

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    Also check for any vacuum leaks.
     
  4. Sep 30, 2009 at 2:50 PM
    #4
    tmantstud

    tmantstud [OP] High Mileage Work

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    Thank you for your advice. Are the fuel injectors hard or expensive to replace? I dont want to drop alot of money into my truck right before I go to college.And could replacing the MAF sensor help at all?
     
  5. Sep 30, 2009 at 2:59 PM
    #5
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Moderator

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    Well....The #1 cause for this code is a MAF sensor issue, so it may be wise to replace it, if cleaning it did nothing.
     
  6. Sep 30, 2009 at 4:38 PM
    #6
    tmantstud

    tmantstud [OP] High Mileage Work

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    Thank you, I think I will pick up a refurb one online, they are only about $80
     
  7. Sep 30, 2009 at 4:39 PM
    #7
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Moderator

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    Keep us posted. :)
     
  8. Oct 3, 2009 at 12:02 PM
    #8
    tmantstud

    tmantstud [OP] High Mileage Work

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    Ok. I have found a used MAF sensor from a truck exactly like mine on ebay for $25. The truck had 175,000 miles. Would you trust this sensor to work properly for at least a year?
     
  9. Oct 3, 2009 at 12:33 PM
    #9
    jfr02

    jfr02 Well-Known Member

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    did you check for the vaccum leaks?i myself have never replaced a maf sensor for this code.you need to check for vacum leaks.you can use propane or brake kleen spray it around intake,fuel injectors you will hear the idle rise when a leak is found.on older cars and trucks you need to check your intake hose.your looking for leaks after the maf sensor.don't just start replacing parts till your sure of the source of the problem.it is cheaper to take your time and diagnos it right then to just throw parts at it.
     
  10. Oct 6, 2009 at 4:39 PM
    #10
    tmantstud

    tmantstud [OP] High Mileage Work

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    Thank you. I will try that, but I have never heard of using brake cleaner or propane to find the leaks, it seems kinda odd to me.
     
  11. Oct 6, 2009 at 5:04 PM
    #11
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Moderator

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    If useing propane, the engine will begine to rev when near the leak.
     
  12. Oct 6, 2009 at 5:11 PM
    #12
    fletch aka

    fletch aka www.BeLikeBrit.org

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  13. Oct 6, 2009 at 5:23 PM
    #13
    thisERICtaco

    thisERICtaco Well-Known Member

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    i agree
     
  14. Oct 7, 2009 at 11:50 AM
    #14
    tmantstud

    tmantstud [OP] High Mileage Work

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    That makes sense since propane is combustable
     
  15. Oct 8, 2009 at 8:14 AM
    #15
    rickyticky

    rickyticky Member

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    It is perfectly normal to use propane to find leaks on cars intake and vacuum lines.

    matter of fact some service manuals for cars has you do that as a step.

    older carburated cars actually tell you to use propane to set idle mixture and such.

    so no worries. once u try it your gonna fall in love with it.
     
  16. Oct 8, 2009 at 9:46 AM
    #16
    tmantstud

    tmantstud [OP] High Mileage Work

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    I went to try to find the leaks and my dad had a coniption at the thought of my finding leaks using a combnustible substance in the engine bay while the engine was running. Is he paranoid or is explosion a possibility?
     
  17. Oct 8, 2009 at 9:48 AM
    #17
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Moderator

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    Just paraniod.
     
  18. Oct 8, 2009 at 10:03 AM
    #18
    jab08

    jab08 Well-Known Member

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    Do you have a aftermarket air filter say any filter you have to put oil on?? If you over oil it the oil could get on the maf and make that code appear. Just a though.:)
     
  19. Oct 8, 2009 at 10:07 AM
    #19
    jab08

    jab08 Well-Known Member

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  20. Oct 8, 2009 at 1:11 PM
    #20
    00YotaComa

    00YotaComa HAWAII SELLS MORE TACOMAS THAN ANY OTHER STATE!

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    I just had my MAF go out on me too. That code is usually always that MAF. Mine went out around 161,000, so i wouldn't suggest buying that used one from a motor with 175k. I wouldn't suggest buying a used one at all. For about $150 u can get a new one and then u won't have to worry about it for like ten years.
     
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