[quadslo]

Today one new rattle became noticeable when doing a turn. It sounds like a screw/nut/coin is rolling inside the lower plastic part of the passenger seat from one side to another in a turn.

How can I remove the plastic back of the seat to check if anything is there? It sounds like it is located at the bottom.

 

[danchee]

Did you ever figure this out? I finally found the source of my rattling and it's the same location!

 

[quadslo]

No, it stopped at one point. I still beleive that there is a screw which fell off somewhere stuck inside.

 

[Boxster Annie]

I had a strange rattle from my passenger seat back. Turned out to be the seat belt buckle banging on the seat back when turning.

 

[danchee]

I had a strange rattle from my passenger seat back. Turned out to be the seat belt buckle banging on the seat back when turning.

This wasn't the seatbelt buckle. Took car of that one early on. I stuffed a piece of cloth into the seat back plastic from the bottom and silenced it but there was still a noise. Turns out the roof liner is a little loose as well. Dealer took it off and found the metal clips bumping into the roof mount points so glued the clips and applied felt on metal contact areas.

 

[Boxster Annie]

Hopefully that solved it for you.