The most frequently mentioned issue when buying a used Mercedes-Benz CLA 200d 8G-DCT 2020: AdBlue / SCR system faults. Also, DPF regeneration and clogging issues are frequently reported.
Be cautious
Most reported issue: AdBlue / SCR system faults. Service history and a test drive matter.
Listed from most frequently reported, each with its source.
The OM654 engine in the CLA 200d uses an advanced SCR system with AdBlue and NOx sensors. On the road, faults are reported in the dosing pump, injection nozzle, and NOx sensors; they can cause warning messages, performance limitation, or in some cases more serious issues.
Exhaust Emissions
If the vehicle is mostly used for short trips in the city, the DPF can clog because effective regeneration is prevented.
Exhaust Emissions
The OM654 engine uses a dual-circuit EGR system that can accumulate soot and deposits over time, especially in city driving. This can lead to slow or stuck EGR valves, rough idle, warning light illumination, and fault codes.
Exhaust Emissions
The OM654's high-pressure common-rail system and piezoelectric injectors require proper fuel and maintenance. Fault codes related to the high-pressure pump (e.g., P0251) or injector failures can occur; this can cause power loss, hard starting, and rough idle.
Fuel System
Turbo pressure loss codes and faulty turbo sensors/actuators are reported in OM654 engines. Common causes include faulty actuators, intake leaks, or stuck variable geometry.
Turbo
Same trim, different year
We only publish claims we can verify. Cards come from European fault records and owner reports matched to this vehicle on brand, fuel, engine and generation.