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  1. EGR valve

    06-07 LBZ & LLY Duramax Powertrain
    I have had my 07 classic for two years and every 3-6 months the CEL would come on and then go off after a week or so. I figured it was exhaust related (the truck is bone stock) and that i just had a sensitive sensor. The past three weeks it has come back on, gone off, and then immediately come...