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.

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2001 A4 1.8T Q Casablanca White, Tip, ESP, Xenon and Premium