Code P0420
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Thread: Code P0420

  1. #1
    Driver's Ed
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    Code P0420

    P0420

    This is a permanent code cannot be cleared with code reader.
    Will only clear if system decides problem no longer exists.

    I used CRC Intake valve cleaner as directed after one week I re-scanned problem has now gone away.

    My conclusion is that dirty valves were causing said code.

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  3. #2
    4th Gear
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    P0420 is not that type of code. It is able to be cleared with a scan tool.

    It's possible dirty valves could lead to poor running which could poison a cat. But it's not likely. I haven't seen any notably filthy LE2 intake valvetrains yet. Not have I seen an instance where a spray in intake cleaner cured a truly failed cat. It was more likely a fuel related issue that time resolved.

  4. #3
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    Quote Originally Posted by Ma v e n View Post
    P0420 is not that type of code. It is able to be cleared with a scan tool.

    It's possible dirty valves could lead to poor running which could poison a cat. But it's not likely. I haven't seen any notably filthy LE2 intake valvetrains yet. Not have I seen an instance where a spray in intake cleaner cured a truly failed cat. It was more likely a fuel related issue that time resolved.
    Ok, that's interesting my bluedriver scan tool indicated it was a permanent code?

    You might well be right regarding the fuel, I had just ran some Redline SI 1 complete fuel system cleaner through it and the code threw up shortly afterwards, any thoughts as to why?

    So, the little Cruze egr/valvecover does a pretty good job of "catching" those nasty oils after all. What kind of buildup and at what mileages approx have you observed the valves?

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  6. #4
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    This is a service issue and not a tutorial - moved from Gen II Engine/Trans Tutorials to Gen II Service Issues
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