New member here. Ive had my 2011 XF 2.2D Auto for a couple of years now. I have an issue with a banging from underneath when under acceperation. Only really does it under load from lower speeds. Ive had the centre propshaft bearing changed, both rear drive shafts changed and its still there. Also what can only be described as the drumming sound like you get when a back window is open. What can be the issue and are they both linked? Any advice greatfully received