Mercedes Sprinter 2.2 CDI Turbo

Which turbo for the Sprinter 2.2 CDI depending on the engine generation — OM611, OM646.984 or OM646.986?

The answer varies by generation. The first 2.2 CDI in the Sprinter was built around the OM611, fitted to the 211 CDI, 311 CDI, 411 CDI and their variants, each with their own manufacturer references. The move to the OM646 family marks a clear break: the OM 646.984 is fitted to the 209 CDI, 309 CDI, 409 CDI and 509 CDI at 88 hp, the OM 646.985 covers the 109 hp and 150 hp versions (OM 646 DE22LA), while the later variants — 213 CDI, 313 CDI, 513 CDI at 129 hp, 215 CDI, 315 CDI and 515 CDI at 150 hp — use the OM 646.986, OM 646.989 or OM 646.990, each with their own distinct turbo references.

Identifying the correct reference: the engine code is essential

Two Sprinter 2.2 CDI models with identical power outputs can carry incompatible turbos if their engine codes differ. The engine identification plate is the only reliable guide: an OM 646.984 and an OM 646.985 share the same engine capacity but have different variable geometries and different manufacturer references — mixing them up leads to an impossible fit or an immediate loss of power. Equivalent references (prefix A, suffix 80…) denote the same part under a different packaging or distribution channel; they do not indicate a technical variant.

Common failure causes on these diesel engines

On the OM646 in particular, oil circuit fouling — often made worse by excessively long service intervals under heavy or loaded use — weakens the CHRA bearings and causes excessive play. The classic symptoms are blue smoke on acceleration, a characteristic whistling noise and the vehicle entering limp mode. Before any replacement, it is essential to identify and address the root cause — oil quality, intake hose sealing, EGR circuit condition — to prevent a rapid recurrence. The turbos listed on this page are new.