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check engine light

Discussion in '1st Gen. Tacomas (1995-2004)' started by fish, Jun 14, 2010.

  1. Jun 14, 2010 at 7:05 AM
    #1
    fish

    fish [OP] fish

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    i have a 2004 tacoma and my truck is got the check engine light on and the is code p0031 i just need to no what this code means?
     
  2. Jun 14, 2010 at 7:25 AM
    #2
    Blumpkinson

    Blumpkinson Fuelled by plutonium and wild animals

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    My 03 threw this code last week, it is low voltage heater sensor1/ bank 1. I cleared the code with the scanner and it has not returned. Try clearing it with the scanner or disconnecting the battery, so the ecu will reset itself. If the code reappears then you will probably need to replace the 02 sensor.
     
  3. Jun 14, 2010 at 7:30 AM
    #3
    fish

    fish [OP] fish

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    4'' procomp suspenchin lift 33x12.50x17 procomp x terrans and procomp wheels
    which o2 sensor would it be cause i know that there is a up stream and a down stream bank1 sensor1.
     
  4. Jun 14, 2010 at 7:40 AM
    #4
    HondaGM

    HondaGM Roll Tide

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    is this a 4 or 6 cyl?
     
  5. Jun 14, 2010 at 7:41 AM
    #5
    fish

    fish [OP] fish

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    4'' procomp suspenchin lift 33x12.50x17 procomp x terrans and procomp wheels
  6. Jun 14, 2010 at 7:46 AM
    #6
    HondaGM

    HondaGM Roll Tide

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    it is the one closest to the engine
     
  7. Jun 15, 2010 at 8:21 AM
    #7
    fish

    fish [OP] fish

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    4'' procomp suspenchin lift 33x12.50x17 procomp x terrans and procomp wheels
    could it be a relay? cause the first code it through wasp0051 and now it's p0031.
     
  8. Jun 15, 2010 at 9:08 AM
    #8
    fish

    fish [OP] fish

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    4'' procomp suspenchin lift 33x12.50x17 procomp x terrans and procomp wheels
    well i mite have ha bigger problem than i think i unpluged the battery to let everything reset and i pluged it back up and now the check engine light poped back on and the truck is idling low and wont let my a/c compressor come on it is idling about 400 i need help!!!!!
     
  9. Jun 15, 2010 at 9:23 AM
    #9
    Blumpkinson

    Blumpkinson Fuelled by plutonium and wild animals

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    As for the idle when you reset the ecu, it needs some time to get the correct air/fuel ratio. Mine did the same thing, huge pain in the ass when you drive stick, was back to normal in a few days.

    Is it still throwing the same code?
     
  10. Jun 15, 2010 at 9:31 AM
    #10
    fish

    fish [OP] fish

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    ya still the same code
     
  11. Jun 15, 2010 at 9:56 AM
    #11
    98tacoma27

    98tacoma27 is gooder 'en chicken Moderator

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    You're truck is in "limp" mode.

    Interesting that it threw a P0051 even though it only has one AFR.

    Here are somethings to check

    .........but chances are you will need a new AFR. I highly suggest getting the OEM DENSO sensor.
     
  12. Jun 15, 2010 at 10:01 AM
    #12
    fish

    fish [OP] fish

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    so this is the bank1 sensor1 afr sensor?what is the cheapest place to buy it?
     
  13. Jun 15, 2010 at 10:09 AM
    #13
    98tacoma27

    98tacoma27 is gooder 'en chicken Moderator

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  14. Jun 15, 2010 at 10:16 AM
    #14
    fish

    fish [OP] fish

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    and this would be the front one right?
     
  15. Jun 15, 2010 at 10:17 AM
    #15
    98tacoma27

    98tacoma27 is gooder 'en chicken Moderator

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    5100's all on fours
  16. Jun 15, 2010 at 10:18 AM
    #16
    98tacoma27

    98tacoma27 is gooder 'en chicken Moderator

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    5100's all on fours
    $152 at URD and $114 at Rockauto

    2004 V6 - 3.4 Auto Front = 234-9001
     
  17. Jun 15, 2010 at 10:18 AM
    #17
    fish

    fish [OP] fish

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    ok thanks ya'll are a HUGE help!!!!!you guys are awsome!!!
     
  18. Jun 15, 2010 at 10:20 AM
    #18
    98tacoma27

    98tacoma27 is gooder 'en chicken Moderator

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    5100's all on fours
    Check Rockauto's vendor forum. They may still have a discount code available. Or you could always PM them.
     
  19. Jun 15, 2010 at 10:30 AM
    #19
    Blumpkinson

    Blumpkinson Fuelled by plutonium and wild animals

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    Quick question how do you know that the afr sensor needs to be replaced when the code is for a faulty O2 sensor heater?
     
  20. Jun 15, 2010 at 11:36 AM
    #20
    98tacoma27

    98tacoma27 is gooder 'en chicken Moderator

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    5100's all on fours
    Because the heater is located inside the sensor.
     
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