Used Mercedes-Benz B-Class Engine

The W246 B-Class ran from 2011 to 2018, with a facelift arriving in 2014 that brought interior and exterior updates. For engine purposes the generation boundary that matters most is the engine code, not whether the car is pre- or post-facelift. Always confirm your engine code from the V5 or a VIN check before buying a used unit from a breaker.

A 2013 car sits in the pre-facelift W246 and a 2016 car in the post-facelift W246, so they share a generation but cross the 2014 facelift boundary. Engine codes are the reliable guide here — if the codes match, the core unit is likely compatible, but whether ancillary brackets, mounts, or sensors were revised around the facelift is something you should confirm with the breaker against your registration. Never assume fitment on year alone.

No, trim level does not affect engine fitment on the B-Class. Sport, SE, and AMG Line are specification packages covering interior, wheels, and cosmetic items, not mechanical differences. The engine code, fuel type, and gearbox type are what the breaker needs to match — your trim badge is irrelevant to the mechanical fit.

The badge refers to the power output tune, not necessarily a completely different engine family, but the engine codes may differ even between CDI variants and some may share a common block in different states of tune. You must quote your exact engine code to the breaker rather than relying on the B180 or B200 badge, as fitting a mismatched code can cause problems beyond just power differences. A good breaker will cross-reference your registration to confirm before quoting.

This is an important area to discuss directly with your breaker and the garage doing the fitting — we can't state as fact how Mercedes coding and immobiliser pairing will behave in your specific car. What is well established is that modern Mercedes engines can involve ECU pairing, so your fitting garage needs to be aware of this before the job starts. Confirm the position with both the breaker and a Mercedes-experienced technician before you commit.

The W245 ran from 2005 to 2011 and the W246 from 2011 to 2018 — these are distinct generations with different engine families, so cross-generation fitment is very unlikely to be straightforward. Engine codes, management systems, and mounting arrangements differ between the two platforms. Confirm with a breaker against both registrations before pursuing this route.