Just curious if anyone has experienced a rattle from the passenger side door area on their C250. It only starts rattling after going 40 mph or faster. It's driving me crazy so I'd love to hear if anyone has the same problem and how you fixed it.

 

First you have to find the source of the rattle---to do that put the car on a lift--run the car---nose around---where is the rattle coming from!!

 

moved to W204 forum...

 

The seat belt tensioner is a possibility. If you still have a factory warranty the dealer will take care of any rattles.