I'm currently having a right mare with my A3 mainly relating to the glow plug light flashing and the car going into limp mode.Had it scanned when it first started and then the car was fine and the light stayed off, one of thje faults was water on the ecu. The light goes on and goes of for a past time days at a time when its off no problems the car runs smooth and is lovely but when it decides to come on its just a ball ache.Could water dmg to the ecu make it be like this? I'm going to get it scanned again to see if any other faults come up but its doing my head in