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Ecu Code Error

Discussion in 'ECU's, Electronics, and Tuning' started by blitzcivicsi, Mar 3, 2003.

  1. blitzcivicsi

    blitzcivicsi Junior Member

    Likes Received:
    Mar 3, 2003
    hey every morning for the past two days when ive started my car the check engine light comes on with:
    fault code = p0420 ENG and the discription is:
    cat sys effic b1 below threshold
    i think it means my cat is about to die but im not to sure. can anyone tell me exactly what this means and what i need to do to fix it.
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