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Author of "101 Projects"
Join Date: Jan 1995
Location: Rolling Hills Estates, CA
Posts: 27,056
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Actually, (and I'm not a CAT expert) I believe that a faulty O2 sensor will make the car run rich, which will make it smell a bit sulfury (is that a word)?
The rich running, I believe, causes the smell, and also causes the CAT to stop working effectively. Again - not 100% sure here, but I think that the cause and effect are backwards. Rich causes smell and ruined CAT, not ruined CAT causes smell...
-Wayne
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