Closing Assist/Door Lock Issues Due to Pneumatic System Problems on Mercedes-Benz 300SD

Problems with the pneumatic system can cause closing assist and door lock issues.

RepairPal Verified
Average mileage: 310,000 (310,000–310,000)
2 model years affected: 1992, 1993
4 people reported this problem
2 people shared problem details
the doors will close with the assist when I pull fuse and trunk and reset it it works for a while
Close assist never worked since I had the car. We are in the process of replacing all of the components including the two vacuum pumps
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