Faults, repairs and advice from our workshop

Articles about the faults we most often fix on Mercedes vehicles: how to spot them in time and what gets done at the workshop.

TCU reprogramming and transmission board repair

What the TCU is, how to recognise a fault and which transmission electronics we work with.

Key goes in, but the car doesn't react? What the EZS is, why it fails and how it's repaired.

Is transmission oil really lifetime oil, and why a flush isn't the same as a change.

Why the turbo is often the victim rather than the cause, and what gets checked before fitting.

Red or yellow: what each colour means and when to stop immediately.

Rattling on start-up, camshaft faults and why the timing can't wait.

Why the warning light is on even though the tyres are fine, and what to do after changing wheels.

What gets recorded in the electronic service record and why it pays off when you sell the vehicle.

Transmission won't leave P or reports a gear selection error? The cause is often the DSM / ISM module.

Why a fault code isn't the same as a diagnosis, and what a proper inspection looks like.

When to replace pads and discs, and why brake fluid is just as important.

What to do when the temperature warning light comes on, and the most common causes of overheating.

Why the battery drains while the car is parked, and how the cause is found.