Mercedes-Benz C-Class C 250 CDI / C 250 d Engine Replacement - OM651 2.1 Diesel Engines

Mercedes-Benz C-Class C 250 CDI / C 250 d Engines for Sale | Engine Finders

If you're looking for a reconditioned Mercedes-Benz C-Class C 250 CDI / C 250 d engine, a rebuilt unit, or a reliable replacement, you're in the right place. The Mercedes-Benz C-Class C 250 CDI / C 250 d badge spans more than one engine across its production run (OM651.911 / OM651.921), so getting the exact code right matters more than the badge or year alone. Engine Finders matches UK buyers searching for 'engine for sale', 'reconditioned engine price' or 'engine replacement cost' for this model with vetted suppliers who carry the correct unit for your exact vehicle — supply-only or supply-and-fit, used or professionally reconditioned, whichever suits your budget and timeline.

Mercedes-Benz C-Class C 250 CDI / C 250 d Replacement Engines

Whether you call it a rebuilt engine, a remanufactured unit, or a reconditioned replacement, the work involved is broadly the same across every application: a full strip-down, inspection against factory tolerances, replacement of wear parts, and bench testing before it's fitted or dispatched to you.

C 250 CDI / C 250 d Models & Engine Codes

The C 250 CDI and C 250 d use the OM651, a 2,143 cc four-cylinder common-rail diesel rated at 204 PS (150 kW), across two generations. The W204 (2008 to 2014) carries the OM651.911, and the W205 (2014 to 2018) the OM651.921. There was no W206 C 250 diesel, so this page closes the generation boundary: if you own a current C-Class diesel, you need the C 220 d page instead. The OM651 also powers the C 220 CDI at lower outputs, the E 250 CDI, the CLS 250 CDI and many vans, each at its own tune, but the C 250 should be matched to its own 204 PS specification. The OM654 of the later C 220 d is a different family and not a substitute. Before ordering any used, reconditioned or rebuilt unit, confirm your exact code from your V5C or the number stamped on the engine block itself.

Buy Used and Second-Hand Mercedes-Benz C-Class C 250 CDI / C 250 d Engines

Used engines across these applications do come up for sale in the UK, generally sourced from donor or accident-damaged Mercedes-Benz C-Class C 250 CDI / C 250 d vehicles. Weigh a cheaper used unit's unknown history and lack of warranty against a reconditioned unit that gets you back on the road with confidence.

Mercedes-Benz C-Class C 250 CDI / C 250 d Engines in Stock

We work with a UK-wide network of suppliers who carry reconditioned, rebuilt and remanufactured engines for every Mercedes-Benz C-Class C 250 CDI / C 250 d application listed here, along with used units where buyers prefer that route. Give us your registration and we'll confirm current stock, typical lead times, and whether supply-only or supply-and-fit makes more sense for your situation.

Warranty for Replacement Mercedes-Benz C-Class C 250 CDI / C 250 d Engines

Warranty terms for a replacement engine are set individually by the supplier we match you with — typically around 12 months on a reconditioned or remanufactured unit. Always get the warranty length, what it covers, and the VAT and fitting basis confirmed in writing before you commit.

Mercedes-Benz C-Class C 250 CDI / C 250 d Engine Problems & What to Check Before Buying

General specialist commentary on these engine families covers the usual wear points for engines of these types and ages. We note this as general background, not a confirmed finding for any specific vehicle — ask your supplier what inspection was carried out on the unit you're being quoted. OM651 family-level timing-chain wear and injector and emissions-system issues are documented, and we state them at family level only, with no C 250-specific fault claimed without evidence. Ask your supplier whether the timing chain, guides and tensioner were inspected or renewed, which injectors and emissions parts are included, and what the warranty covers.

What's Included in a Reconditioned Mercedes-Benz C-Class C 250 CDI / C 250 d Engine

A genuine reconditioned or remanufactured unit should include a full strip, clean and inspection against factory tolerances, replacement of gaskets, seals and wear items, and a bench test before it leaves the workshop. What's not always included — ancillaries like the turbo, injectors or auxiliary belt components, and whether the price is supply-only or supply-and-fit — varies by supplier, so ask for this in writing alongside your quote rather than assuming it's covered.