Re: Grinding Noise in 96 740il with 86,000 miles (archive)

cats are covered under federally mandated warranty to 80k, so at 86k you don't get the benefit, but the diagnosis is simple--you'll be able to dear the rattling at low speeds or idle as well with the windows down--put on a lift, and tap on the cats with a rubber mallet--if they rattle, they're bad--take it to a private shop--these guys are generally willing to do a diagnosis for you without asking for a 5 hour labor charge--and, can probably tell you with a test drive how the tranny is working--just had tranny svc done and the tranny runs like new now, had the cats done as well--they are two completely different sets of diagnostic problems--if the cats aren't bad, then you can concern yourself witht he other potential issues--good luck
Sounds like the catalytic converter problem I had. Dealer reluctantly replaced my left side cat. I heard from other independent mechanics that the cat is covered under Fed regulation for free replacement up to 100K miles, so CPO warranty is not a major issue here. Good luck!

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