I have a 99 ML 320 and heard it making noises, they said that it had a big hole in the cat. converter but could try to weld it and see how long it lasts. I seemed to fix the problem, but 2 months later I hear it coming back. Does this make sense and how much should I expect to pay to buy a new one and have it installed? What could have caused it to get a big hole? Can salt air do this?
Thanks,
Kimmy