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Check Engine - Code 28

Discussion in '80-Series Tech' started by lovetoski, Sep 22, 2003.

  1. lovetoski

    lovetoski SILVER Star

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    Today the check engine light went on, I retreived the diagnostic code per my Haynes manual, and it's #28. Per Haynes this is the Post Catalytic converter, a diagnosis of "open or shorted circuit in the post catalytic converter oxygen sensor circuit." OK, I think I kinda understand....I read a bit further, specifically re testing the oxygen sensor...I think I could do all this...
    But I wonder, does the code just mean I should replace the second sensor?
    BTW, I reset the codes, ran the cruiser again, and no check engine light comes on. Could it be a fluke?

    Any and all help is welcome!
     
  2. Beowulf

    Beowulf

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    Somewhere in the foothills...
  3. lovetoski

    lovetoski SILVER Star

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    Thanks Beowolf...you'd think w/a college degree I could read...
     
  4. sleeoffroad

    sleeoffroad Supporting Vendor

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    Not sure on that one. You don't have a post catalytic O2 Sensor on a 94 :eek: Be carfeull what the Haynes manual recommends.