Audi Repair Questions? Ask a Mechanic for Answers ASAP
how are the tires? does it go away in neutral coasting?
Generally this is a wheel bearing. Try driving on an open road with no traffic, and swerve slightly left to right, see if it changes the sound as you shift the weight of the vehicle from left to right. If it goes away when you swerve one way, then the wheel bearing on that side is bad.