Mercedes Workshop Manual Om646 Engine Jun 2026

The Mercedes-Benz OM646 engine is a cornerstone of the German manufacturer’s "four-cylinder diesel dynasty." Produced from 2003 to around 2010, this 2.1-liter (2148cc) common-rail turbodiesel succeeded the legendary OM611 and preceded the OM651. Found in everything from the C-Class (W203/S203) and E-Class (W211) to the Sprinter van and Vito, the OM646 is renowned for its robustness, fuel economy, and long service life.

CDI-D common rail diesel injection (Delphi) with 1600 bar max pressure. Mercedes Workshop Manual Om646 Engine

Several websites offer digital workshop manuals for purchase. For the OM646, you can find manuals from: The Mercedes-Benz OM646 engine is a cornerstone of

Explicit maps for the Crankshaft Position Sensor (CPS), Camshaft Position Sensor, Manifold Absolute Pressure (MAP) sensor, and Rail Pressure Sensor. Several websites offer digital workshop manuals for purchase

Check the Camshaft Position Sensor (CMP) and Crankshaft Position Sensor (CKP). If these sensors fail to synchronize, the engine control unit (ECU) will not trigger fuel injection. Summary for the DIY Mechanic

The OM646 utilizes a duplex timing chain located at the front of the engine. Unlike rear-timed modern engines, servicing this is highly accessible but requires strict alignment.

A good workshop manual provides clear troubleshooting flowcharts for known failure points unique to this engine family. The "Black Death" (Injector Seat Leakage)