M4Rob

Definitely stated in my first post all the things that I’d already tried… but still no luck!

Hi all, Ive not long ago picked up a 2016 B9 Avant 3.0tdi and love it but I have a particularly annoying rattle/vibration noise coming from the drivers door which I’ve tried to fix, but thus far unsuccessfully. It doesn’t make the noise all the time, but only when going 75mph+ on motorways etc. The only way I can think to describe the sound is if you trapped a very angry butterfly in a Tupperware box… It seems to be coming from the bottom of the drivers door ish, but difficult to pin point. I’ve uploaded a link to the sound on YouTube: https://youtube.com/shorts/nK9Z5K6-c20?si=iefGeFgFnZ95MYtf You can just about hear it on the video above. I’m pretty hands on with this sort of stuff, so have fully taken off the door panel and went for a drive yesterday to eliminate the panel vibrations and it’s not that. I’ve looked for loose trim and on the underside of the car but nothing loose there either. I've also fully taped up all the of the door and window seams to eliminate the door seals being the culprit and still no luck. Does anyone have any ideas or experience of this? any help would be hugely appreciated. thank you! Rob