Carbon deposits and injection problems
Often reportedDirect injection engines like the M264 can develop carbon deposits on intake valves and injector issues, which may cause idle fluctuations, micro-misfires, or reduced efficiency.
Engine Internal
The most frequently mentioned issue when buying a used Mercedes-Benz C-Class C300 2023 (206): Carbon deposits and injection problems. Oil consumption and leaks are also commonly reported.
Engine varies by trim; verify the engine code on the listing.
Listed from most frequently reported, each with its source.
Direct injection engines like the M264 can develop carbon deposits on intake valves and injector issues, which may cause idle fluctuations, micro-misfires, or reduced efficiency.
Engine Internal
Higher than normal oil consumption and leaks (gaskets/covers) are frequently reported on 2.0 turbo M264 engines. The issue may manifest as level drops between services, dashboard warnings, or noises from inadequate lubrication.
Engine Internal
Many users report a characteristic metallic rattling noise in the first seconds after a cold start; this may indicate chain/tensioner or timing gear issues. In most cases the noise disappears after a few seconds, but a service check is recommended.
Timing chain
Some European users report that gear changes on older automatic transmission variants (7G/9G) are not always ready or feel delayed/unresponsive. This may cause slow shifts or unusual jerking in sport mode.
Transmission
Turbocharger failures are reported to cause power loss, exhaust smoke, or unusual noises. On 2.0 turbo direct injection engines, turbo failures can lead to costly repairs.
Turbo
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.