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  1. #1

    Default 03 gmc sierra denali p0420/p0420pd errors

    Hello all,
    As the title says, I have a 03 GMC Sierra Denali and I'll getting a p0420 and p0420pd errors.
    I have been told that I have to use a replacement denali catalytic converter instead of a aftermarket parts.

    Are they just trying to make me eat $100's for factory parts, or CAN I use aftermarket parts in my truck?

    Thanks in advance.

  2. #2

    Default

    You can use after market, we all do.
    Ray

    '09 Avalanche LTZ - Black
    '05 Envoy XL (sold)

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