Diagnostic Code help
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Northstar Engines and System Technical Discussion Discussion, Diagnostic Code help in Cadillac Engine Technical Discussion; My check engine light came on today and said service emissions system, it gave me the code PC0139 Current. Can ...
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    feef706 is offline Cadillac Owners Member
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    Diagnostic Code help

    My check engine light came on today and said service emissions system, it gave me the code PC0139 Current. Can someone tell me what this code is? Thanks James

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    BeelzeBob's Avatar
    BeelzeBob is offline I'm a Cadillac Fanatic!
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    Re: Diagnostic Code help

    Quote Originally Posted by feef706
    My check engine light came on today and said service emissions system, it gave me the code PC0139 Current. Can someone tell me what this code is? Thanks James
    Pre converter O2 sensor slow response. Likely need to replace the O2 sensor that is immediately ahead of the cat.

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