[quote="X5-D-Sport Salisbury"]
I got a rattle under the RH side of my drivers seat, its as if there is a chunk of plastic swinging about...
Corner left & then right... and .... clonk.... cannot find the cause at all....
Emptied the car door pockets, hunted under the seat...
A year on and it still eludes me. I even stripped the drivers door incase it was some thing IN the door flopping about...
AND... if I found the cause... I'd apply yards & yards of tape to stop the dreaded "clonk"

) :blink:
[/quote]
Have a look in the air outlet vents to the rear seat area, that are under the drivers seat.