The TS"s problem is mechatronics failing, very common problem at 80k-100k mileage. The part cost around 10k+ to replace. All German brands become money pits after 5 years, so far out of the big 3 German brands Audi gave me the most problems, mechatronics problem, water pump failure, radiator puncture, front wheel arms rubber fail, fuel injector problem, oil seperator problem, even the radiator fan can break lol. 8 years old, got rid of it after the repairs.