burning smell
#11
Misfire or something can put too much unburned fuel & air into the cat, making it overheat. It's not so much that the cat fails from it's own lifespan; but the cat is overworked (overheated) by another problem with the engine's operation. A new cat will not last long unless you fix the real problem.
#13
I doubt it would be any kind of sensor. If the "Check Engine" light is NOT on, I would take it to an exhaust shop and ask them how much they charge to check out the cat. Being in NY, I assume they salt the roads in the winter? That would shorten the lifespan of exhaust components in my opinion.
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