Hello, can anyone tell me how to stop condensation building up in my near side tail gate light. This is causing a warning sign on my dash display and part of the red light not to work. 

The seal has probably gone on it. Two options, remove and thoroughly dry, using a hair-dryer. You can try a thin bead of Sikaflex (clear) around the seam and refit. The second option, is find a second hand unit. The trouble with second hand is they can be worse than what you have. You can buy new too, but it will be expensive. 

Hi 

I have just bought a second hand unit. And it was fine at first. It only seems to happen in the damp months of the year. I will try the sealant you suggested. It’s a bad design problem with A6 Audi’s I think. 
 

thanks, 

Craig 👍