On my '96 Accord I got a Check Engine Light; diagnosed it at a cat converter problem (code 67). I recall recently scraping the exhaust system on a speed bump and thought maybe this had something to do with it. I reset the light and so far it hasn't come back on.

If my cat is indeed bad, will the light eventually return or by resetting the light have I now permanently eliminated any warning signs of its failure?

BTW, The car has nearly 250K miles; how long can I expect the cat to last? I'm impressed it's lasted THIS long!