Knocking Noise Over Bumps Due to Worn Sway Bar Link Joints on Mercedes-Benz C320 4MATIC

Problem Description and Possible Solution

The sway bar end link joints may wear and cause a knocking noise over bumps. Loose or warn links should be replaced to correct this type of noise.

Problem Data
RepairPal Verified
Average mileage: 133,000 (122,000–144,000)
3 model years affected: 2003, 2004, 2005
5 people reported this problem
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Loud knocking noise over driver's side when hitting a bump in the road, knock not present at higher speeds. Replacing the sway bar end links solved the problem, car is whisper quiet now. Price was $486.60 for both sides at an independent shop.