Originally Posted by 
shanegtr
				 
			Im going to go completely outside what everyone else is suggesting - only based off one of my previous experiences. A few months after buying my D3 I started noticing a high pitched "squeak" coming from the drivers front. Was only occurring while going over bumps etc. I could get it to squeak in the driveway by moving the car by hand, however it was only when moving the suspension heights that it gave a longer "squeak". Turned out I had a leaking airbag that was only getting exposed in certain strokes of the airbag and the steak was just an air leak. New complete strut assemblies sorted that out