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Is a sulfuric, "rotten egg" smell the sign of a cat conv. on its way out? If not, what are the signs and smells, how often would they occur, etc. Any insight would be helpful.
 

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It could be as simple as getting some crappy gas. My wifes Mazda has a TSB regarding this sulfur smell and the solution is to use either Amaco or Exxon or BP gas. No more sulfur smell for us.
 
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