The most frequently mentioned issue when buying a used Mercedes-Benz E-Class E350 2014 (207 / 212 / Facelift): Cooling system problems. Also, carbon buildup on intake valves is commonly reported.
Engine varies by trim; verify the engine code on the listing.
Listed from most frequently reported, each with its source.
Some examples report faults related to the cooling circuit: stuck thermostat, water pump, or related component failure. These issues can cause abnormal engine temperature management, diagnostic warnings, and in severe cases, overheating.
Cooling
On direct-injection V6 engines, carbon deposits can build up on intake valves and ports over time. Typical symptoms include rough idle, lack of response at high RPM, increased fuel consumption, and the need for periodic cleaning (e.g., walnut blasting).
Engine Internal
The PCV (crankcase ventilation) system can fail or become deformed, leading to excessive crankcase pressure, oil entering the intake manifold, increased oil consumption, deposit buildup, and contributing to electrical issues.
Engine Internal
The V6 3.5 engine (M276) in the E 300 may experience timing chain tension and rattling noise, especially when cold. The issue also affects belt tensioners, guides, and camshaft phasers. If neglected, it can worsen timing and cause further damage.
Timing chain
Same trim, different year
We only publish claims we can verify. Cards come from Difetti fault records matched to this vehicle on brand, fuel, engine and generation.