"Is the Cls 220d reliable, and what should you check?"
When buying a used Mercedes-Benz CLS 220d 2021 (257), the most frequently mentioned issue is: AdBlue / SCR system anomalies. DPF clogging is also commonly reported.
Engine: OM654
OM654.920 · diesel · 220d · Used in this car from 2019-2023
Known engine issues
Short rocker arm lifespanA known weak point of this diesel engine is the short lifespan of the rocker arms.
Camshaft and hydraulic lifter replacement if neglectedIf this problem is overlooked, the camshaft and hydraulic lifters will need replacement.
Bosch CP4 fuel system sensitive to poor fuelThe Bosch CP4 fuel system with piezo injectors does not tolerate poor-quality fuel at all.
+2 more issues on the engine detail page
Known issues and risks
Listed from most frequently reported, each with its source.
AdBlue / SCR system anomalies
Often reported
Reported anomalies and faults in the SCR/AdBlue system (dosing pump, AdBlue nozzle/injector, crystallisation in the line); can trigger warnings, NOx errors, and sometimes require immediate attention.
Exhaust Emissions
DPF clogging
Often reported
The 2.0 OM654 diesel engine can experience frequent incomplete regeneration or DPF clogging, especially with city or short-distance driving.
Exhaust Emissions
Carbon buildup in EGR valve
Often reported
In OM654 engines, the EGR valve tends to accumulate soot and carbon deposits, leading to faults, ECU errors, and efficiency loss.
Exhaust Emissions
Piezoelectric injector sensitivity
Often reported
The OM654 engine family uses advanced high-pressure piezoelectric injectors that can be sensitive to fuel quality and maintenance; this may lead to injector failure or power loss.
Fuel System
Mercedes-Benz Cls 220d technical specs
Mercedes-Benz Cls 220d (2021): boot 520 L; fuel use 5,1 l/100 km (urban 6,1 l/100 km · extra-urban 4,6 l/100 km); 0–100 in 7.5 s.
Boot capacity
520 L
Fuel consumption
5,1 l/100 km (urban 6,1 l/100 km · extra-urban 4,6 l/100 km)
What should I look for when buying a Mercedes-Benz CLS 220d?+
When buying a 2021 model 220d, check the service history, test drive, and look for engine/transmission warnings. Most commonly reported issues: AdBlue / SCR system anomalies; DPF clogging; carbon buildup in the EGR valve.
What are the common problems of the Mercedes-Benz CLS 220d?+
Most frequently reported issues: AdBlue / SCR system anomalies; DPF clogging; carbon buildup in the EGR valve.
Is the Mercedes-Benz CLS 220d reliable?+
Rather than a simple yes/no, it's best to weigh the proven pros and cons together. This page lists 4 verified findings.
How does Carbeak collect data?+
The cards on this page are derived from the Difetti fault database; the source vehicle and target vehicle are verified for brand, fuel, engine, and generation compatibility. Topics with insufficient evidence are not shown.
We only publish claims we can verify. Cards come from Difetti fault records matched to this vehicle on brand, fuel, engine and generation.
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