I just rode in the back seat of my X5. There is a rattle coming from both sides in the rear seat, the passenger side a bit louder than on the driver side.
I tried touching every piece of trim from top to bottom — I could not find the piece rattling. However, when I press pretty hard on the area circled below, the rattle is diminished. I'm afraid it's something inside the door.
Interested if this is the source of others' rattles.
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