hi, i just had a rattle fixed in my z4m coupe, it sounded like it was coming from behind passenger seat, and sounded like a loose speaker, took it to bmw sylvania, and they accessed it, and booked it in,
apprently there was a screw that had come out in the roof and there was something in roof causeing the knockin sound.
now all fixed, no rattles , and they even replaced the cup holder that was rattleing, so in this case dealer has acctually fixedthe problem with out causeing more problems!
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