Newbie here
On the doorjam of my 1993 940 there is a "warning" sticker to replace the seatbelt tensioners 10 years after manufacture. I am wondering if this is the rattling sounds coming from the back seat. I havent really put alot of time into locating the rattling/knocking sound, but nothing in/on or under the car is out of place or awry. Any ideas? Thanks for your reply post.

 

Anything loose in the trunk?
I think they extended the air bag and seatbelt rpelacements to 15 years.
I doubt that is the noise(Seatbelt)