Thank you for the update on your original query. It's something I might have to look into for my Gen2. Shortly after getting it I used to notice an annoying intermittent tapping coming from the back somewhere. This went on for months; some journeys I wouldn't notice it at all and others it would be fairly persistent or be present for a few minutes then stop then come back again. I tried taking everything out of the boot and back seat area, rooted around in various cubby holes and behind linings, sticking down any loose wiring I could see (including the ones connecting the rear parking sensors, which trail along the bumper somewhat loosly).
To cut a [very, very, very] long story short, I eventually noticed the rear wheel arch liners aren't held in place very firmly. As a test I stuck the rear-left one (passenger side) against the metalwork with a piece of sticky felt (the same stuff I'd used to prevent the parcel shelf from rattling) and I have not heard the rattle since. I've been meaning to sort out a tidier solution but I haven't got a scooby how one goes about fitting a new lining or even whether it is the lining itself or the area in which it is mounted where the problem lies.
Of course, since that rattle was sorted a bunch of others have started up elsewhere, such is the nature of these things...
