I have a 03 2500 w/ auto transmission and about to hit 100k. I was wondering what the life of the catalytic converter was. This is my first diesel so I am not too sure. I had a 97 dodge with a gas engine and that had O2 sensors. At least with that one I would know if the sensors were throwing a check engine light. Then there was the ever popular rattle from the destroyed insides of the cat. Any info would be appreciated.