Hi all hope someone can help. I have an 57 plate a3 s- line 2.0 tdi and am having a few problems. Herei s my issue,the car starts and drives perfect but has now got smoke coming from the exhaust, it losses coolant, the coolant does not seem to be leaking from any pipes and cant see any on the floor whrn parked up, i have checked for head gasket issues but this seems to be all good. The car has had a new waterpump and cam belt and a new temperture sensor. When driving it at times goes into limp mode over a certain speed so need to restart engine to gain power back. I have been told that it maybe a turbo issue. I do not have any warning light on the dash at all and when i plugged in to do a test no codes came up. Can anyone give me some ideas on what it could be please