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Old thread, sorry to resurrect. Is this still an issue? I have the same problem - everything comes back on when I smack the passenger side of the dash, vertically kind of between the lighter adapter and the hot/cold dial for the heat/AC. Still trying to figure it out - wondering if it is...

Is there a reason it wouldn't have thrown the code earlier?

Hey guys, don't blast me - I spent a long time (well over an hour) searching and reading the forums, and found plenty of info about P0421 code, and EGR Valve issues, but nothing that made them seem like they could possibly related. Here's the background, but first let me say that everything on...