Exactly the same symptoms I have experience for the last year. I replaced my original EGR with a NAPA valve, and the P0405 code came back a few months later. I had that one replaced (under warranty) and now, a few months later, the P0405 code is back. I can clear the code, but it comes back after a couple miles driving. I'll be taking the EGR back to the same shop that diagnosed it as bad to see if I have another bad one. I'm not sure what course of action I'll take this time. I guess warranty exchanges until the warranty expires, then buy another new one...![]()