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P0138 after blower motor resister change

Discussion in '2nd Gen. Tacomas (2005-2015)' started by mrcheap, Jul 11, 2020.

  1. Jul 11, 2020 at 11:34 AM
    #1
    mrcheap

    mrcheap [OP] Well-Known Member

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    Went to change the blower motor resister because of the common no fan on low settings issue and got a P0138 upon startup.

    Is it coincidence or related because I didn’t disconnect the negative terminal on the battery.

    I googled and it seems P0138 has to do with the O2 sensors. I don’t have an advanced scanner to dive deeper yet. Any advice?

    Thanks

    05 TRD DCLB 155k miles
     
  2. Jul 11, 2020 at 11:57 AM
    #2
    mrcheap

    mrcheap [OP] Well-Known Member

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    I disconnected the battery and let it set for awhile. Turned it back on and the CEL hasn’t come back but now it’s running rough/vibration and idling low rpm below 500 rpm as if it would stall at any minute.

    I did change the plugs a month ago and has been running fine until I changed the blower motor resister.
     
  3. Jul 11, 2020 at 7:06 PM
    #3
    DG92071

    DG92071 Well-Known Member

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    Changing the blower motor resistor will have no affect on O2 sensors or the CEL.

    If the battery is disconnected long enough the ECU will forget all of its fine tune settings. It has to be driven to relearn those settings.
     
    Jimmyh likes this.
  4. Jul 11, 2020 at 7:19 PM
    #4
    Jimmyh

    Jimmyh Well-Known Member

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    Drive it and it will relearn the idle...
     
    DG92071 likes this.
  5. Jul 11, 2020 at 7:56 PM
    #5
    TnShooter

    TnShooter Well-Known Member

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    I agree.

    Clear it, drive it, and see if it returns.
    That the is first steps of the simplified version of the diagnostic flow chart.
     
    Jimmyh likes this.
  6. Jul 12, 2020 at 5:49 AM
    #6
    mrcheap

    mrcheap [OP] Well-Known Member

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    Yea I did some further googling and I just leftthe car on for about 10 mins and it returned to normal.

    The CEL has not returned either. Fingers crossed.

    thx
     
    DG92071 likes this.

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