Annoying humming noise?
 

Could it just be a cold start issue? Sounds like its coming from the right side of the car when I'm inside. Sounds like a loud pitch hummmm.

Back right would be fuel filter.

check your power steering fluid. i got the same issue and my fluid was low.
 

got a small bttle from Carson and the noise went away.

Thanks Al!

2nd to this. Be sure to use Audi approved fluid. Dealer topped mine over the max line.

The noise has departed.