MinorAffected: 2007-201450,000–120,000 miles

Mercedes-Benz C-Class W204 C220 CDI — Electric Window Regulator Cable Failure

The cables inside the electric window regulator mechanism fray and snap, causing the window glass to drop into the door frame.

Severity

Minor

DIY Difficulty

Moderate

Est. Cost

£100–£200

OBD Codes

None

Symptoms

Grinding or crunching noise when operating the window switch
Window glass drops down into the door and won't come up
Window sits crooked in the frame

Root Cause

The steel cables run over plastic pulleys. The plastic pulleys degrade and crack, or the cable frays and tangles inside the motor drum.

How To Fix

Remove the interior door card to access the regulator.
Tape the window glass 'up' temporarily to secure the vehicle.
Replace the entire window regulator mechanism (usually supplied without the motor).
Cost: £100-200

Estimated Repair Costs

Repair Option	Est. Cost (GBP)
DIY (parts only)	£40–£80
Independent Garage	£100–£200
Main Dealership	£160–£320

Other Faults on This Variant

Delphi Piezo Injector Failure

Critical

2008-201230,000–100,000 miles0

Early OM651 engines (2008-2012) were fitted with Delphi piezoelectric injectors that failed so frequently it resulted in a massive global recall and class-action lawsuits.

Air Conditioning Condenser Leak (Stone Damage)

Minor

2007-201440,000–120,000 miles£250–£450

The 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.

Front Anti-Roll Bar Drop Link Wear

Minor

2007-201430,000–80,000 miles£60–£120

The front anti-roll bar drop links wear out on heavily potholed UK roads, causing an annoying knocking sound at low speeds.

Disclaimer: Repair cost estimates are indicative and based on community data. Always get a quote from a qualified mechanic before proceeding with any repair.