Quote:
Originally Posted by lkchris
Codes are often set downstream of the actual problem.
Unless the CAT is broken up and rattling it would be the last thing I'd suspect.
A CAT can't do it's job if the "mixture" it receives is off. When it can't do its job the code sets, but the problem is the mixture, not the CAT.
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Really? I've seen plenty of Cats that cease to function without rattling. I destroyed the Cat on a Lex LS 400 limping home on 4cyl. That car had 1 coil per bank and when I lost a coil the raw fuel fried the Cat. Didn't rattle a bit. Bad cats on the 3.2 with <100,000miles is not terribly uncommon in my experience.
As an aside, if you had under 80,000 miles, I think the manufacturer would have to replace under warranty.