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CEL on, no codes pop up.

Discussion in '1st Gen. Tacomas (1995-2004)' started by 2toyboy4x4, Apr 13, 2025.

  1. Apr 13, 2025 at 9:53 PM
    #1
    2toyboy4x4

    #1
    2toyboy4x4 [OP] New Member

    Joined:
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    Vehicle:
    03 Taco 4dr 4x4 black
    Changed both o2 sensors. CEL went off. Then came back on a week later. Cleaned MAF sensor. CEL went off for about a week. Back on again. Hooked up my craftsman OBD2 scanner. 0 codes. Started up after disconnecting the scanner. CEL is off. And I didn't erase it. ???
     
    2toyboy4x4, Apr 13, 2025
    #1
  2. Apr 14, 2025 at 7:03 AM
    #2
    Glamisman

    #2
    Glamisman Well-Known Member

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    When the CEL is turned on the data that triggered the light is stored in memory. This is called freeze frame and it should still be there. See if your scan tool can access it. The trick is to figure out by looking at the the data what is right and what is wrong.
     
    Glamisman, Apr 14, 2025
    #2
    2toyboy4x4[OP] likes this.

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