Used BMW 4 Series Steering Box

No — the BMW 4 Series (both the F32/F33/F36 generation from 2013 and the G22/G23/G26 generation from 2021) uses an electric power steering rack, not a steering box. A steering box is a recirculating-ball unit found on older or heavier vehicles; modern BMWs use a rack-and-pinion assembly instead. If you need the steering component on your 4 Series, you are most likely looking for a steering rack (also called a steering rack and pinion or EPS rack).

The part you need is a steering rack — specifically an electric power-assisted steering rack (EPS rack), as the 4 Series does not use hydraulic assistance or a steering box at any point in its production. When requesting a quote from a breaker, search for 'BMW 4 Series steering rack' and quote your registration so the breaker can confirm the correct unit for your engine and generation. Specifying your exact model year is important as the F32-generation (2013–2020) and G22-generation (2021-onwards) racks are entirely different assemblies.

Only if your car is also an F32-generation 4 Series — the F32 coupe, F33 convertible, and F36 Gran Coupé all share the same basic platform and the rack may interchange within that generation, but you should confirm with the breaker against your registration as engine variants and steering ratio options can affect which exact unit is fitted. The later G22-generation (2021-onwards) uses a completely different platform and its rack will not cross over. Always give the breaker your full registration number to verify the correct part.

Trim level alone does not determine the steering rack fitted to your 4 Series, so an SE, Sport, or M Sport badge by itself does not mean a different rack. However, if your car has an M Sport or M440i specification it may have a different steering ratio or adaptive steering system compared to a standard rack, so this is worth confirming with the breaker against your registration rather than assuming all racks interchange freely. The cosmetic differences between trims — different wheels, interior finishes, body kits — have no bearing on the steering rack fitment.

No — what happened in 2021 was not a facelift but an entirely new generation: the G22 replaced the F32 platform completely, and the two generations share no steering rack parts. The F32-generation ran from 2013 to 2020, and the G22-generation began in 2021, so make sure any rack you source is from the correct generation for your car. Confirm the specific part with your breaker using your registration number to be certain.