Mercedes-Benz E-Class W212 E220 CDI — Front Anti-Roll Bar Drop Link Wear
The front anti-roll bar drop links wear out on heavily potholed UK roads, causing an annoying knocking sound at low speeds.
Severity
MinorDIY Difficulty
Easy
Est. Cost
£60–£120
OBD Codes
None
Symptoms
- Light knocking or rattling noise from the front suspension over rough roads
- Noise is most pronounced at 10-20mph over speed bumps
Root Cause
The ball joints at either end of the drop link lose their grease and the nylon cups wear out, creating play in the joint.
How To Fix
- Jack the car and check for vertical play in the drop link.
- Replace in pairs (left and right) for best results.
- A very simple DIY job, but the nuts are often seized and need to be cut off.
- Cost: £60-120 at a garage.
Estimated Repair Costs
| Repair Option | Est. Cost (GBP) |
|---|---|
| DIY (parts only) | £24–£48 |
| Independent Garage | £60–£120 |
| Main Dealership | £96–£192 |
Other Faults on This Variant
Timing Chain Stretch (Rear Mounted)
CriticalLike BMW's N47, Mercedes placed the OM651's timing chain at the rear of the engine. It is a single-row chain that stretches over time, causing a loud rattle on cold starts.
Air Conditioning Condenser Leak (Stone Damage)
MinorThe air conditioning condenser is mounted at the very front of the cooling pack, making it highly susceptible to stone damage from the road, leading to refrigerant loss.
Alternator / Smart Charge System Failure
SevereModern vehicles use smart charging systems to reduce engine load, but the complex regulators on the alternators frequently fail.
Disclaimer: Repair cost estimates are indicative and based on community data. Always get a quote from a qualified mechanic before proceeding with any repair.