03 gmc sierra denali p0420/p0420pd errors

Discussion in 'Chevy Silverado Forum (GMC Sierra)' started by Randallgr, Apr 9, 2013.

  1. Randallgr

    Randallgr New Member

    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. RayVoy

    RayVoy Active Member

    You can use after market, we all do.

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