Hi, I have a 2003 Honda Stream, last June the engine check lights is on, and the error reading as exhaust deterioration, I then send it to exhaust sifu, they told me to replace the cat-con, to a normal stainless steel chrome piece. After they replace it they reset. But the lights came back on after a day. My car current mileage is 250k. I want to know, is it normal to change the cat-con? Some told me is Oz censor problem, but where can i get the potong set for the 2 censor, cause the ori ones very expensive.