Why is my W205 C-Class knocking from the front or riding bouncy?
W205C238
Short answer
A W205 C-Class that knocks or creaks from the front over bumps usually has worn control-arm bushes or ball joints, or worn stabiliser links; a floaty, bouncy ride points to tired front shock absorbers. The W205 has a four-link front axle, so there are more arms to check than on the older C-Class; a workshop finds which one has play.
Checked by the M&B Parts team, 5 October 2026.
Symptoms
- A clunk or knock over speed humps and potholes at low speed.
- A creak or squeak from the front suspension, sometimes worse in cold or dry weather.
- A floaty or bouncy ride, nose-dive under braking, or oil on a shock body.
- Wandering, vague steering or uneven front tyre wear.
Likely causes
Safety first
- Have a qualified workshop diagnose the fault before you buy parts. Several faults look alike, and a list of symptoms is not a diagnosis.
- This page is information only. Have safety-related parts fitted by a qualified workshop.
- Steering and suspension parts are safety-critical. Have a qualified workshop inspect and diagnose the car before buying parts.
- Get a wheel alignment after replacing control arms or tie rod ends.
- A badly worn ball joint can separate. If the steering suddenly feels loose or the car pulls hard, stop driving and have it checked.
Parts we stock for this problem
Front suspension parts, C-Class W205 and E-Coupe C238
The front shock is a conventional shock, not for AIRMATIC cars.
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New aftermarket parts, OEM-quality. Prices include 15% VAT.
Which part fits my car?
| Model | Engine | Years | Part |
|---|---|---|---|
| C-Class W205 sedan, estate (S205) | all non-AMG | 2014–2021 | Conventional suspension; AIRMATIC and AMG cars use different struts/arms: confirm by VIN Suspension Kit / Control Arm Kit - W2... |
| C-Class Coupe / Cabriolet W205 (C205 / A205) | all non-AMG | 2015–2023 | Confirm by VIN |
| E-Coupe C238 | all non-AMG | 2017–2023 | Control arm kit per our listing Suspension Kit / Control Arm Kit - W2... |
Changeover dates differ by market; the VIN is the sure check.
Questions
What's the price of a W205 front suspension kit?
The live prices are on the cards above. Our 12-piece control arm kit for the C-Class W205 and E-Coupe C238 covers both sides; single lower and upper arms, stabiliser links and front shocks are listed separately.
My W205 creaks over bumps. Is something broken?
Creaks are usually a dry or worn bush or ball joint, and some W205s do it more in cold or dry weather. It isn't urgent if there is no knock or play, but have a workshop check the arms and links at your next service.
Can I replace just one front shock?
Shocks should be replaced in pairs on the same axle, so the car stays balanced when braking and cornering.
Do these parts fit a W205 with AIRMATIC?
AIRMATIC cars use air struts instead of the conventional front shocks on this page, and some arms may differ. Send us your VIN and we'll check.
Are these Mercedes-Benz factory parts?
No. They are new aftermarket parts, OEM-quality, with the 6-month CPA warranty against defects. For fitted parts we need the RMI- or MIWA-accredited workshop's invoice. See our returns policy.
M&B Parts sells new aftermarket parts, OEM-quality, with the 6-month CPA warranty against defects. For fitted parts we need the RMI- or MIWA-accredited workshop's invoice. See our returns policy.
15A Fountain Road, Eastleigh, Edenvale 1609 · WhatsApp 073 429 7245
Related problems
- Why is my W204 C-Class knocking or clunking from the front?
- Why is my W203 C-Class knocking or clunking from the front?
Sources we checked
- mercedesblog.com/new-4-link-front-axle-in-c-class-more-comfort-and-...
- en.wikipedia.org/wiki/Mercedes-Benz_C-Class_(W205)
- mbworld.org/how-tos/a/mercedes-benz-c-class-why-is-my-suspension-no...
- www.benzworld.org/threads/w205-suspension-squeak.3114575/
- www.yourmechanic.com/article/symptoms-of-bad-or-failing-stabilizer-...
- en.wikipedia.org/wiki/Mercedes-Benz_E-Class_(W213)
