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REWARD if successful: help me identify where this annoying interior rattle is coming from 2021 M3P

Hi guys, i would be grateful if you could help me identify where this annoying rattle is coming from. Its a plastic sounding tapping sound coming from the rear boot area in my 2021 M3P. It comes on uneven roads and is worse when going downhill. I will give a reward to the person who correctly localises where the rattle is coming from!

Thanks in advance

 
Last edited:

MrBadger

Formerly VanillaAir_UK
Jun 17, 2019
9,293
6,888
Surrey, UK
Hi guys, i would be grateful if you could help me identify where this annoying rattle is coming from. Its a plastic sounding tapping sound coming from the rear boot area in my 2021 M3P. It comes on uneven roads and is worse when going downhill.

Buckle up all the seat belts to see if things change, including front passenger. If no difference, drop the rear seats flat and try again.
 
My money is on the passenger side rear side cushion ( the piece that’s left once you fold the seat down ) mine is not fitted properly and makes some noise, I also have a really bad rattle/knock coming from the front passenger seat when it’s empty but that’s louder than your noise.
 
I have a similar annoying rattle (Mine is Sept 2020 M3 LR) and while there was a break in the weather that aligned with me having some free time (no Garage for me to work in) I did some investigation work and came to the conclusion that it could be a lose Rear boot latch (see link to short video I made). unfortunately the weather turned bad before I could start pulling off the cover on the boot lid to inspect. Before I devote anymore free time on the issue, can anybody confirm if this loose latch is normal and it loose by design?

Login - Dropbox
 
You can locate rattles and such using an app on your phone, connecting to the car's entertainment system, turn the volume up and go through the frequency until it starts to resonate. I can't claim I came up with this I saw it on a Youtube video but I've been doing it for years and it works every time.

The app I use is called 'tone generator' on an iPhone. I'm sure there are plenty of others for all phones.

p.s. what's the reward?
 
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