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Thread: P0420 CEL code

  1. #1
    Bald Tire
    Join Date
    Jun 2015
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    hutto, tx
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    P0420 CEL code

    I got CEL for months and thought it was O2 sensors so I replaced both. Same code. Last year I already replaced with aftermarket exhaust manifold and that cleared code. Could it be exhaust manifold again?


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  2. #2
    Low Profile
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    Feb 2017
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    I have the code occasionally too. Iíve already replaced the down stream O2 sensor. I do have an exhaust leak at the flange under the passenger rear door though, so Iím hoping when I fix that itíll clear up.



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