I have a sound coming from my passenger seat as well. I have tried seat belt adjustment and it did not work. When I move the seat it stops for a while and comes back. I'm due for my first service in 600 miles. I was planning to let them know. I had a noise in my drivers seat too that took 3 trips to fix but they finally found it. Something about the seat airbag. Strange to hear sounds in a BMW. That is one of the reasons I drive them.... disappointing on a $100K car.
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