I had to replace the catalytic converter and I know a lot of people with cars that have twice as many miles and they have not had to replace the catalytic converter yet. It is a very expensive repair. I heard Toyota has a 7 year warranty on at least some of their converters.

car would only go about 25 miles an hour. problem seemed to just come on all at once. one minute it ran fine the next it wouldn't go at all. my mech. put a new converter from another gm product on it and now its fine. i understand a new one for this model cost much more.