Genuine OEM Audi Diesel Engine Control Unit, part number 04L906026KE8V0. This control unit is responsible for managing the various functions of the diesel engine, including fuel injection, ignition timing, and emissions control. It is located within the engine bay, typically mounted to a bracket. The unit measures approximately 20.6 cm in length, 18.5 cm in width, and 4 cm in height, weighing 0.967 kg. Precise calibration and correct firmware are essential for the proper functioning of the engine and emissions systems, making genuine OEM parts critical for this component.