The most frequently mentioned issue when buying a used 2020 Mercedes-Benz GLB 180d DCT is carbon buildup in the EGR and intake manifold. Additionally, high oil consumption and leaks from the oil separator are also commonly reported.
Caution advised
Most reported issue: Carbon buildup in EGR and intake manifold. Service history and a test drive matter.
Listed from most frequently reported, each with its source.
In modern diesel engines (including OM654), significant carbon deposits can form in the EGR system and intake manifold, reducing their effectiveness. This can cause rough running, worsened fuel consumption, and loss of engine response.
Engine Internal
Some technical reports for the OM654 indicate higher than expected oil consumption or oil traces in turbocharger pipes due to leaks in the oil vapor separator/crankcase ventilation. This can lead to oily residue in the intercooler and intake ducts, reducing performance.
Engine Internal
Some vehicles with SCR (AdBlue) report warnings related to NOx sensors, crystallization in the AdBlue injector, or pump/dosing unit failures; this can lead to error messages and power limitation.
Exhaust Emissions
The DPF can clog, especially on short city trips, preventing full regenerations.
Exhaust Emissions
Owners report issues such as actuator problems, play in rotating parts, or oil leaks into the intake circuit; this can lead to loss of boost pressure, smoke from the intake, or reduced performance.
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.