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Sulfur scent usually a bad cat. Under federal law that is covered if original for 8 year/80,000 miles. IF you got the code P0420 - catalyst below threshold that confirms faulty cat. However a misfire could damage the catalytic converter, which is what the dealer will probably tell you its your fault for letting the engine damage the exhaust and most likely sell you both O2 and a cat. In conjunction with correcting misfire. I suggest taking care of misfire first then bring it to dealer for the P0420 code.
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