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Oxygen sensor heater code

Discussion in '80-Series Tech' started by JasonH, Oct 22, 2003.

  1. JasonH

    JasonH

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    Check engine light is on. If I reset the light, it won’t come back on as long as the engine is running. When I shut it off and restart, the light comes back on immediately.
    Autozone’s reader gives two codes. Both are for oxygen sensor heater (one for sensor 1 and one for sensor 2). I replaced the cat and both sensors and still get this code. One person suggested that the problem lies in the computer itself.

    Thoughts?
     
  2. JasonH

    JasonH

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    I should probably mention this is on my 95 FZJ80. :slap:
     
  3. Beowulf

    Beowulf

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    Jason,
    You should also mention what codes you are getting.
    -B-
     
  4. Safado

    Safado

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    B-

    You always so subtle? ;) Nice to see that at least you spread the love around. :D :D
     
  5. Beowulf

    Beowulf

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    Safado,
    :slap:

    IMHO, expecting posters to help us help them is reasonable.

    Jason,
    If you don't have the codes then look at the wiring & harness going down to the O2 sensors. There have been a couple of reports where the wires have become frayed and caused problems.

    -B-
     
  6. JasonH

    JasonH

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    No worries. I'll go back and have them rescan it. I wasn't paying attention to the actual code numbers, just the description after each one. I'll post back later with the actual codes.
     
  7. JasonH

    JasonH

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  8. Beowulf

    Beowulf

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    Jason,
    P0131: O2 Sensor Circuit Low Voltage (Bank 1 Sensor 1)
    P0141: O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 2)


    Do you have the FSM for troubleshooting these codes? If not, here are some general things to check.

    (HO2S=Heated O2 Sensor)
    · Contaminated HO2S sensor or connector (coolant, water, silicone, fuel, oil, etc.)
    · Chafed/damaged wiring
    · Crossed HO2S signal/signal return wiring

    · Short to VPWR in harness or HO2S
    · Water in harness connector
    · Open VPWR or GND circuit
    · Poor electrical connections from PCM to HO2S sensor
    · HO2S heater

    Someone else will have to post the troubleshooting steps for your 95.

    -B-