Hi,

I have an '06 A4. Whenever I take it through the car wash, 2-3 lights pop on and I lose my turbo power. It also happens if I am driving on a rainy day. Is this normal? It is hard to accelerate on the highway with no turbo, and makes driving a total pain.

 

You should be under warranty, so have the dealer read the codes.
Make sure they get it wet.