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This was a recent purchase for me (not my first Box though). It runs great and had no real notable change when the O2's were replaced other than the CEL's didn't come back. So there might have been a short in one of them? I didn't bother to test them after replacement.
420, right, sorry I was thinking engine orientation backwards, I should know that. I don't know anyone anymore that does the analyzing, but I'm sure I could track down a local shop that'd do it for a couple of bucks. Probably worth it. Why replace a cat when I may not need to?
Other thing I was going to try this weekend was swap O2's from side to side. See if I get a P0420 instead of a P0430. If I do, then I know one of my new O2's is probably bad.
So, still things to check. Good side is codes are different and there's only one now.
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