lkchris -- thanks. Apparently cats fail frequently on M-B cars. I only own one, but my parents have half a dozen and love them. The S-class has been a remarkable vehicle in general, though lately it has had a few problems crop up. I get the distinct feeling that dealers are just throwing parts at it as temporary fixes, rather than taking the time to figure out the actual underlying problem. Believe me, I want to be wrong.

In non-M-B cars, every cat I've ever seen burn up was due to a bad O2 sensor causing an incorrect air-fuel mixture, ruining things downstream. In fact, I don't think I've ever seen one fail outside those circumstances, though I don't claim it's necessarily so here -- certainly seems coincidental, though. Most of these experiences for me are in gasoline racing applications, not daily drivers.

lmac -- start your own thread to warn others about another dealer -- it has nothing to do with a problem occurring in Texas!

Cheers, John

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'98 E300TD (W210) | Sold 6/09 with 205k and counting
'04 VW Touareg V10TDI