Second Hand Mercedes-Benz B-Class Gearbox

Both years fall within the second-generation B-Class (W246, 2011–2018), so they share the same basic platform, but whether the gearbox crosses cleanly depends on the engine code — make sure both cars carry the same code, which you can find on your V5 or via a VIN check. The W246 received a facelift in 2014, and ancillary or mounting details can shift across that boundary, so confirm with the breaker against your registration before buying. Engine code match is the single most reliable guide here.

No — the first-generation B-Class (W245, 2005–2011) and the second-generation (W246, 2011–2018) are built on different platforms with different engine families, so the gearboxes are not interchangeable. Always match on generation first, then narrow down by engine code and gearbox type (manual or automatic/7G-DCT). A breaker will need your registration or VIN to confirm compatibility.

For the W246 B-Class, trim levels such as SE, Sport, and AMG Line are cosmetic and equipment grades; they do not determine which gearbox is fitted. What actually dictates the gearbox is the engine code, fuel type (petrol or diesel), and whether the car left the factory with a manual or the 7G-DCT dual-clutch automatic. Confirm the engine code on both donor and recipient cars and you can disregard trim entirely.

The engine code is the most important detail you can supply — it overrides the year, badge, or trim level when matching mechanical parts like gearboxes. You can find it on your V5 logbook or by running a VIN check; common W246 diesel codes include the OM651 family and petrol units include various M270 variants, but quote the exact code rather than relying on the badge alone. Giving the breaker your full registration alongside the engine code will allow them to verify the specification quickly.

No — manual and automatic gearboxes are entirely different units and are not interchangeable, and changing between them would involve significant ancillary work beyond just the box itself. On top of the mechanical differences, ECU pairing and immobiliser coding implications are something you must confirm with the breaker and a Mercedes specialist before proceeding, as these can affect whether the car will start and run correctly. This type of conversion is complex and not a straightforward used-parts swap.

The second-generation B-Class (W246) ran until 2018, when it was replaced by the third-generation W247; a 2019 car would be a W247, making the two generations different platforms with different drivetrains. A gearbox from a 2019 W247 is very unlikely to fit a 2017 W246 without significant modification, if at all. Confirm the generation and engine code with the breaker against both registrations before agreeing anything.