Code p420
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Joined: May 2006
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Code p420
Hey my CEL came on about a couple of days ago. I had it checked out at the local part store and it came back with code p420. I recently had my cat replace and the egr valve port clean. I guess I am wondering if the cat is gone bad again? (do i have two or one cat converter) or could it be the o2 cesnsor?
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