Second Hand Mercedes-Benz B-Class AC Compressor

The B-Class runs across two main generations: the first-generation W245 (2005–2011) and the second-generation W246 (2011–2018, facelifted in 2014). Within each generation, compatibility is primarily driven by engine code rather than year alone, so a compressor from a 2013 W246 may not suit a 2016 W246 if the engine codes differ. Always supply your engine code — found on your V5 or via a VIN check — when requesting quotes from a breaker, as this is the single most reliable guide to finding the right unit.

Both years fall within the second-generation W246 (2011–2018), but 2014 brought a facelift and some running changes, so a 2013 unit crossing that 2014 boundary may not be a straightforward swap. Engine code is the deciding factor — if both cars share the same code (for example OM651 diesel or M270 petrol), there is a reasonable chance of compatibility, but ancillary bracket and mounting changes mid-production mean you should confirm the specific part numbers with the breaker against your registration before buying.

For an AC compressor, trim level — whether that is SE, Sport, Urban, or AMG Line — makes no difference to fitment whatsoever, as the compressor follows the engine and not the badge or specification pack. You may receive a compressor with slightly different brackets or a different pulley if it came from a car with a different engine, but that is an engine-code question, not a trim question. Focus on matching engine code, fuel type, and gearbox type, and ignore the trim name entirely.

No — fuel type directly affects compressor fitment because diesel and petrol variants of the B-Class use different engines with different drive arrangements and ancillary layouts. For example, a W246 fitted with the OM651 2.2-litre diesel will require a different compressor to one fitted with the M270 1.6 petrol. Always tell the breaker your fuel type alongside your engine code to avoid being quoted an incompatible unit.

The W245 (2005–2011) and W246 (2011–2018) are entirely separate generations with different engine families, so a compressor from a first-generation car is very unlikely to be compatible with a second-generation car. These are different platforms and the ancillary components are not interchangeable between generations. Stick to sourcing a compressor from the correct generation and, within that, match the engine code precisely when speaking to a breaker.

On some Mercedes-Benz models the AC compressor can interact with vehicle electronics, and whether your specific B-Class requires any configuration after fitting a used unit is something you should confirm with the breaker or a Mercedes specialist against your registration. This is not something we can state as fact here, as it can vary by engine and model year. A good breaker will be able to advise based on the part they are supplying and your car's details.