✓ The faults of this engine were checked against sources (10/2026). Each item has at least two independent sources or an official recall or parts-maker technical note.
Faults that belong to the engine itself. They apply to every model with this engine, and each model has its own extra faults on its model page.
Injector faults and injection control software (misfire, engine light)
usually 30,000–150,000 km · Medium risk
Signs: Engine or injection warning, 'risk of engine damage' message, misfire or rough running, fuel smell, oil level rising
Fix: Read fault codes and check for an ECU software update first; test the injectors one by one and replace only the faulty ones; change the oil if fuel got into it
€100–1,400
Increased oil consumption
usually 60,000–180,000 km · Medium risk
Signs: Oil level drops between services, low-oil warning, sometimes blue smoke on start
Fix: Rule out external leaks and the crankcase ventilation first, use only approved oil, then do a measured consumption test; rings or engine repair only if confirmed
€100–3,500
Oil leak at the timing chain cover
usually 40,000–150,000 km · Wear part
Signs: Oil traces on the timing side of the engine, oil smell, slowly falling oil level
Fix: Clean and find the exact leak point; reseal the timing cover with the specified sealant
€200–800
Thermostat or thermostat housing fault (coolant leak, slow warm-up)
usually 60,000–150,000 km · Wear part
Signs: Small coolant loss or traces at the housing, engine slow to warm up, temperature gauge erratic
Fix: Pressure-test the cooling system; replace the thermostat housing with seals and bleed the system
€200–600
Carbon build-up on intake valves (rough idle)
usually 80,000–200,000 km · Wear part
Signs: Unstable or hunting idle, hesitation, slight power loss, misfire codes when cold
Fix: Inspect with an endoscope; clean the intake valves (walnut blasting or chemical cleaning)
€250–700
Recall: turbocharger oil supply line may leak (Mercedes M282, 2019-2020)
at any mileage · High risk
model years 2019–2021 onlyengine codes: M282
Signs: Oil drips under the car or burning oil smell; oil on hot parts is a fire risk
Fix: Have a Mercedes dealer check by VIN that the free check and line replacement was done
free / recall