Mercedes-Benz B-Class Throttle Body Replacement Parts

It depends entirely on the engine. Petrol-engined B-Class models (such as the B180 and B200 with naturally aspirated or turbocharged petrol units) do use a throttle body to regulate airflow into the engine. However, diesel variants (such as the B180d, B200d, and B220d) do not use a throttle body in the conventional sense, as diesel engines control power through fuel quantity rather than air restriction, so if your B-Class is diesel you are unlikely to need this part.

These are two distinct generations with different engine families, so a straight swap is very unlikely even if the engine displacement sounds similar — for example, the W245 B200 uses an older naturally aspirated unit while the W246 B200 uses a turbocharged engine with a different airflow setup. You should always match by engine code rather than model badge or badge displacement. Give your engine code (found on your V5C or via a VIN check) to the breaker and ask them to confirm the part number matches yours before buying.

The W246 was facelifted in 2014 but the core engine codes largely carried over, which means the throttle body is often the same across the pre-facelift and facelift versions for the same engine. That said, ancillary or mounting details can change mid-production without a formal facelift, so you should confirm with the breaker against your exact registration and engine code rather than assuming year alone is sufficient.

No — trim levels like SE, Sport, and AMG Line on the B-Class are cosmetic and equipment packages; they do not change the engine or its components. A throttle body is determined solely by the engine code, so a B200 Sport and a B200 AMG Line with the same engine code will use the same throttle body. Focus on matching the engine code, not the trim badge, when sourcing from a breaker.

Modern Mercedes-Benz engines can involve electronic throttle bodies that communicate with the ECU, and there is a possibility that calibration or adaptation via diagnostic equipment may be needed after fitting a used unit. Whether full ECU pairing or immobiliser coding is required on your specific variant is something you should confirm with the breaker or a Mercedes-specialist garage before buying, as this varies and is not something we can state as fact across all versions.

The B180 petrol has been offered with different engines across generations — for example, the W246 B180 used engines such as the M270 family, but the exact code on your specific car is what the breaker needs to source the correct part. You can find your engine code on your V5C, via a HPI or VIN check, or sometimes on a sticker under the bonnet. Always quote the engine code directly rather than just the model name, as this is the single most reliable way to ensure you get the right throttle body.