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Oxygen Sensor

Discussion in '1st Gen. Tacomas (1995-2004)' started by jrjgt19, Jan 13, 2020.

  1. Jan 13, 2020 at 9:06 PM
    #1
    jrjgt19

    #1
    jrjgt19 [OP] Active Member

    Joined:
    Jan 6, 2019
    Member:
    #278388
    Messages:
    25
    Gender:
    Male
    First Name:
    Jose
    Panamá
    Vehicle:
    2003 Toyota Tacoma
    I changed the two oxygen sensors and the problem with the check light persists.

    C135466E-D076-4BCB-AA24-158DCC7D0529.jpg
     
    jrjgt19, Jan 13, 2020
    #1
  2. Jan 13, 2020 at 9:07 PM
    #2
    Bishop84

    #2
    Bishop84 Well-Known Member

    Joined:
    Dec 17, 2015
    Member:
    #172494
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    What brand of sensors?

    Did you do a resistance check of the heater circuit on the old sensors?

    Heater circuits are 99% sensors, but sometimes odd things like unrelated fuses or shorts on other sensors causes the heater circuit to fail.

    It gets its power from the EFI relay, so its safe to say that relay is good if the truck starts.
     
    Bishop84, Jan 13, 2020
    #2
  3. Jan 13, 2020 at 9:10 PM
    #3
    jrjgt19

    #3
    jrjgt19 [OP] Active Member

    Joined:
    Jan 6, 2019
    Member:
    #278388
    Messages:
    25
    Gender:
    Male
    First Name:
    Jose
    Panamá
    Vehicle:
    2003 Toyota Tacoma
    I use Denso replacement with the same part number! ‍♂️Sometimes the check light turn off and sometimes turn off but most of the times stay on.
     
    jrjgt19, Jan 13, 2020
    #3

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