Hold down nut for front strut may bacome loose on Mercedes-Benz C240 4MATIC

Problem Description and Possible Solution
The hold down nut for the upper front strut area can become loose, causing a knocking noise. This can be repaired without removing the strut assembly.
Problem Data
RepairPal Verified
Average mileage: 145,485 (145,485–145,485)
3 model years affected: 2003, 2004, 2005
4 people reported this problem