Its not a constant fault but every now and again the door open display comes on even when i know allthe doors areshut,even when i slamthem shut the drivers side indicator keeps flashing,very annoying when yuur tryin 2 see how much fuel u got left. also sometimes in second gear the car (2001 A3 1.8t sport)momentarilyloses a bit of power then picks up almost staight away.im not sure whether or not its turbo lag but if itis what do i do?thanks