Genuine OEM Volkswagen Engine Control Unit, part number 03L906018RD2KC. This control unit is responsible for managing various aspects of diesel engine operation, including fuel injection, ignition timing, and emissions control. It is typically located within the engine bay. The unit measures approximately 205mm in length, 180mm in width, and 40mm in height, weighing 0.88 kg. Genuine OEM status ensures correct firmware and sensor calibration, vital for reliable engine performance and emissions compliance.