You sure the MIL isn't from not tightening the gas cap? It could be an indication of that, or a bad gas cap, or something cheap like that. Don't fear the worst yet. Also, since the cat is part of emissions would it be under warranty? If not maybe you could bring up the fact there was a recall that was related to the cat and it is possible the cat's life was lessend because of the problem requiring the recall.

My hydroponics experiment

You ever notice how hard it is to lip read cartoon characters?
"Crazy is what the sane call Delta Flyer"