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  1. A

    P0299 code, HELP!

    It’s also paired with P0116 code as well.
  2. A

    P0299 code, HELP!

    I’ve got a 2005 LLY Duramax, has an aftermarket air intake, had the muffler removed but kept the cat. Other than that the truck is all stock. Autozone said EGR Valve, I’m not sure. Truck was fine until we just had a heat wave and when I went to start it, glow plug light stayed on longer than...
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