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P0171 Code

Discussion in '1st Gen. Tacomas' started by shaniac, Aug 17, 2010.

  1. Aug 17, 2010 at 3:52 PM
    #1
    shaniac

    shaniac [OP] Well-Known Member

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    My check engine light came on so I went to a local part store and code P0171 came up and it said "system too lean" and "bank 1".
    I got home and looked up the code in my Haynes and code P0171 is "System Adaptive fuel too lean".
    Where do I need to go from here? I am thinking either I need to clean my K&N air filter or could it be a bad O2 sensor?

    I have noticed that when I step on the gas there is a pinging sound coming from the engine; to remedy this I went to 89 grade octane and sometimes I have had to put in the 91 grade octane fuel, which has helped.
     
  2. Aug 17, 2010 at 3:54 PM
    #2
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Thor

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    Clean the MAF first.
     
  3. Aug 17, 2010 at 3:56 PM
    #3
    shaniac

    shaniac [OP] Well-Known Member

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    Thanks, I will try that...hopefully that will solve the problem.
     
  4. Aug 17, 2010 at 7:02 PM
    #4
    tacomaforlife

    tacomaforlife Well-Known Member

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    x2 advanced auto has maf cleaner works great:thumbsup:
     
  5. Aug 17, 2010 at 7:57 PM
    #5
    shaniac

    shaniac [OP] Well-Known Member

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    I used CRC MAF Cleaner. I also purchased a new air filter and had the check engine light reset. It has not come back on yet. I spoke with a friend of mine that has been a auto mechanic for 20+ years and he also told me to check for leaks in the vacuum lines before I go and purchase a O2 sensor...
    Fingers are crossed, LOL
     
  6. Aug 17, 2010 at 8:01 PM
    #6
    cmack

    cmack Impeach Chris4x4!

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    This code has been ruining my life :(
     
  7. Aug 17, 2010 at 8:03 PM
    #7
    fletch aka

    fletch aka www.BeLikeBrit.org

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    Are you using one of the air filters that you have to soak in oil? To much oil could cause problems.
     
  8. Aug 17, 2010 at 10:07 PM
    #8
    shampoop

    shampoop Well-Known Member

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    maf and vacuum leaks. there aren't that many things that cause n/a engines to run lean.

    i once worked on a taco that had a bad pcv valve which caused a ton of oil to get sucked into the intake and soak the maf.
     
  9. Aug 18, 2010 at 6:21 AM
    #9
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Thor

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    4.10 gears, sliders, and lots of buttons.
    Well...The 3.4 doesnt have a PCV.
     
  10. Aug 18, 2010 at 9:19 PM
    #10
    shampoop

    shampoop Well-Known Member

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    [​IMG]

    TIS disagrees
     
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