Mercedes-Benz X-Class Catalytic Converter Replacement Parts

Yes, the X-Class (built 2017–2020) was offered with both petrol and diesel engines, and all variants were fitted with catalytic converter technology as part of their exhaust aftertreatment systems. The diesel models (X 220 d, X 250 d, X 350 d) combine a diesel oxidation catalyst (DOC) with a diesel particulate filter (DPF) rather than a traditional standalone petrol-style cat, so the exact component you need depends heavily on which engine your vehicle has. Confirm your engine code with your breaker to make sure you're pricing up the right part.

The X-Class ran as a single generation throughout its short production life from 2017 to 2020, with no major facelift that is known to have changed the exhaust aftertreatment layout. That said, emissions-related components can vary between build dates even within the same generation, so a part from an early car may not be a straightforward swap onto a later one. Confirm the engine code and build date of the donor vehicle with your breaker before purchasing.

Trim level — whether Progressive, Stylish, or Power — does not determine which catalytic converter is fitted; what matters is the engine code and fuel type. All trim levels sharing the same engine (for example the X 250 d) should use the same exhaust aftertreatment components regardless of specification grade. Focus your search on matching the engine code rather than the trim name, and confirm the specific part number with your breaker.

The X 220 d and X 250 d are both diesel engines but they are different units with different outputs, and the exhaust aftertreatment systems are not necessarily interchangeable between them. Because catalytic converter and DPF interchange specifics are complex and part-number sensitive, this is strong confirm-with-breaker territory — give your breaker your full registration and engine code so they can check the donor vehicle details against yours.

Yes — petrol X-Class models use a conventional three-way catalytic converter, while diesel variants use a diesel oxidation catalyst (DOC) typically combined with a DPF, which is a fundamentally different system. A diesel aftertreatment component cannot substitute for a petrol cat or vice versa, so getting the fuel type right is the starting point before anything else. Always give your breaker your registration and engine code to confirm the correct assembly.

It could, if the part is from a different emissions era or does not match your engine's specification — a visually similar unit from a mismatched engine or build date may not perform to the required standard under MOT emissions testing. Because the X-Class is a relatively rare model in the UK and donor cars are limited, confirm with your breaker that the part number and engine code on the salvage vehicle match your own before buying. A reputable dismantler should be able to check this against your registration.