Your engine is fine. find a new mechanic.
if the exhaust clogs it just dies. your cat ( converter) probably clogged due to a very rich condition, which was detected by the computer, hence the light. my bet is a clogged fuel injector or a sensor (either oxygen or air flow) failed. this made it run rich and the cat probably melted.
get a new cat installed, have them run the codes.
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a clogged catalytic converter can't blow an engine, what idiot told u that??? and we pay these people who hand out this garbage to work on our cars, scary!
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