What causes a knocking sound when turning the steering wheel on a Mercedes-Benz in rough road conditions?

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What causes a knocking sound when turning the steering wheel on a Mercedes-Benz in rough road conditions?

Driving my Mercedes E-Class W211 on rough o r uneven roads in Pakistan often causes a knocking o r clunking noise when I turn the steering wheel. It’s more noticeable on potholes o r speed breakers. Could this be related to the steering column, tie rods, o r suspension? Is this a known issue in locally used o r imported Mercedes cars?

Talha Kyanii asked on 11 Oct 2025 10:43:17 am

1 Answer

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Gari Master - on 11 Oct 2025 10:45:17 am

A knocking o r clunking noise while turning is a frequent issue in Mercedes-Benz vehicles in Pakistan due to poor road conditions. The most likely causes include:

Worn Tie Rod Ends o r Ball Joints: Rough roads and speed breakers often damage suspension parts. These parts can knock when worn out.

Worn o r Damaged Steering Rack Mounts: Over time, the mounts securing the steering rack can become loose o r cracked, leading to movement and noise.

Worn Control Arm Bushings: These rubber bushings absorb road impacts, but break down faster on Pakistani roads, causing noises while turning.

Loose o r Failing Steering Shaft Joints: If the universal joints are loose, worn, o r rusty, especially in older Japanese imports, they can make a knocking noise.

Aftermarket Parts: Some used imports come with non-genuine suspension parts, which fail quickly.

What to do:

Have a mechanic inspect the front suspension while the car is lifted.

Replace any worn-out components with original o r high-quality aftermarket parts.

Get a full suspension check every 10,000–15,000 km due to local road conditions.