Hi guys new to this forum been on many others with my different cars helped many and many have helped me. The problem I have with my a6 tdi is that it is a little noisy on low revs a knock/ rattle between 1000 and 1200 rpm only when your driving not there on idle ?. Little worrying ease off and it goes and when your over 1200 rpm it goes?. Any ideas are gratefully welcomed. Thanks in advance matt