ok just been to my local garage, they pluged in there hand held dianogtic system and 2 faults came up one was a electric fault in cylender 2 (glow plug) which i was aware of as audi dealers told me when i serviced it and the second one was code 16618 Boost Pressure Regulation: Limit Exceeded (Overboost Condition)something which i was told ,anyone got views on it, he checked for loose connection found 1 with the air fitler pipe the one that goes in the engine, that was not put on correctly,and he also found that one of the pipes was worn thin by rubbing against the engine cover, oh and he resetted the fault, and said if it comes back on come back, so if he has resetted the fault if something is wrong will the Emission control light come back on?