Originally Posted by HansSchulz
Thanks for your response. So here is the more detailed sequence: The dealer sent me to Mercedes. Mercedes said they are not responsible because of all the modifications that FR made to the chassis and sent me back to the dealer. The dealer then consulted with FR, was told them to tighten the bolts of the swaybar. They did and returned the car to us, stating the issue had been resolved. The noise did not immediately come back. Only a few weeks later and we are now far away from the dealership who has advised me to contact FR directly. Since they don't respond, I am insisting with the dealer but they are giving me the runabout.
It is a FR issue...they added the Hellwig rear sway bar, not M-B. My local M-B dealer made it very clear that if the chassis didn't leave the M-B plant with it installed it wasn't their issue...
Our 2016 "W" made a nasty cracking sound as well on turns where the road elevation changed. I tightened the sway bar bolts which helped but did not totally eliminate the issue. Do a Search on "Hellwig rear sway bar" in the Solera and Mercedes Benz Sprinter Chassis sub forums for more posts on what folks have done to help address the issue.