My aux belt tensioner is making a right racket at idle. It's probably loud under load too however I don't notice it as much. It's rocking back and forth and looks loose, not sure if this is how it should be.
Had a look at Haynes and it looks simple to replace.
Can anyone shed some light on the correct part number for me? There seems to be a few different designs on eBay.
Car is a 2005 2.0l TDi A3.