Tdi engine noise

[Matthomas24]

Hi all, new to the Audi world (2005 3.0 tdi quattro), drives great and everything seems to be in order but have a high pitch noise which changes in line with engine speed. Any ideas what this could be? It goes like a train, starts every time but always has this noise which I think is coming from the rear of the engine bay but can't be 100%. As the turbo is at the back could this be signs its on the way out?

Cheers Mat

[n31lc]

does the noise happen when you start from low revs and accelerate?

if not and it is only when you shift down and engine brake and it is a sort of whirring high pitched noise it could possibly be the dual mass flywheel or some associated bearings as this is what I had on my quattro. It was a very hard noise to define.