2013–2025 Mercedes-Benz E-Class · common problems & known faults

DPF and AdBlue faults on OM651 and OM654 diesels

Typically appears

80,000+ miles

What to inspect

Check AdBlue warnings and run to full temperature

Air suspension (Airmatic) leaks and compressor failure

Typically appears

80,000+ miles

What to inspect

Check the car sits level after standing and cycle the modes

Injector and turbo actuator faults on older diesels

Typically appears

90,000+ miles

What to inspect

Listen for uneven idle and check for smoke

COMAND infotainment and camera faults

Typically appears

Age-related

What to inspect

Test all cameras, screens and driver assistance

Coolant leaking into the vacuum system causing a hard brake pedal and coolant loss on OM654 diesels.

Typically appears

50,000-80,000 miles

What to inspect

Remove the main vacuum line from the vacuum pump at the front of the engine and check the inside of the pipe for wet coolant residue.

Harsh, jerky gear changes or clunking during downshifts on the 9G-Tronic gearbox.

Typically appears

60,000+ miles

What to inspect

Select Sport+ mode on a test drive, accelerate to 30 mph, and use the steering wheel paddles to force 3-2 and 2-1 downshifts, feeling for harsh engagement.

Splitting and cracking of the Artico synthetic leather on the seat bolsters.

Typically appears

40,000-70,000 miles

What to inspect

Press firmly down on the driver's seat right-hand base and backrest bolsters, inspecting the seams and creases for underlying splits in the vinyl material.

Premature rocker arm and roller bearing wear causing a rhythmic metallic ticking noise on OM654 engines.

Typically appears

70,000-100,000 miles

What to inspect

Start the engine from cold, open the bonnet, and listen closely to the top acoustic cover for a distinct metallic tapping that increases directly with engine revs.