Hi - Newbie here looking for advice as I am about to purchase a 2003 1.8t with 80k for Â£3700. FSH from audi specialist and new coils and lambda sensors + belts and water pump at 55k. The seller has just informed me that the CAT is playing up and the emissions light comes on occasionally. He has offered to replace it for Â£200. Is it normal for the CAT to go on a car with only 80K? Any advice??