Ever since getting the car, I've noticed a whine that starts at about 1500 rpm, and peaks at 2800 rpm. After that it either disappears or drowned out by other noises. It sounds a little like a turbo. It has gotten louder over the first 1000 miles and now seems fairly constant. Of course, I sound-deadened my box, so maybe I am just noticing it more.

I believe this sound is coming from the power steering unit. If I rev the motor to 2800 rpm and hold it there, the sound is clear -- and if I turn the wheel at all, while I am actually turning it the sound increases significantly in volume. Sound like a problem, or is it the nature of the beast?

 

i'd bring it into the dealership and ask them to check it out make sure its all working properly.

 

ours was doing that shortly after we bought it also...we brought it in to the dealership and they replaced it.

 

^^^^^^ agreed ^^^^^^

 

a friend of mine had the same thing after she got her xB repaired.
I think it was because the steering belt was loose.