Quote:
Originally Posted by dgcamero
I can smell some exhaust under the hood. Engine is running smoother than usual. Anyone have experience with this? 
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Smell of exhaust is probably not relevant to codes. Re the 400 code,You definitely have to pull the EGR tube to clean the end of the pipe. It unscrews from the EGR valve. You will have to pull the entire intake ductwork and the rubber vacuum distribution block to get clearance for this pipe to come out of the manifold. It WILL BE clogged at the end.