Genuine OEM Volkswagen Control Unit For Diesel Engine, part number 03L906012BT. This control unit is the central computer for the diesel engine, managing ignition timing, fuel injection, and other critical parameters. It is typically located within the engine bay, often in a protective housing. The unit measures 0.205 m in length, 0.182 m in width, and 0.04 m in height, weighing 0.917 kg. Genuine OEM quality ensures precise calibration and reliable performance, crucial for the complex electronic systems of a modern diesel engine.