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2003 Toyota Corolla Question: Check Engine Light

 

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Visitor, 1.8L 4 Cylinder, New Windsor, NY, September 10, 2010, 08:28

Check engine light comes on and code reads catalyst efficiency below threshold clear code and Check engine light comes back on after some time. What is the remedy to get threshold above catalyst efficiency to keep Check engine light off permanately.

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  • Answer #1

    devilscap4 September 10, 2010, 09:43
     Journeyman

    the catalytic converter will most likely need to be replaced, although, a faulty oxygen sensor can sometimes give false catalytic converter codes.

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