Genuine OEM Audi Diesel Engine Control Unit, part number 03L906023KQ. This control unit is the brain of the diesel engine, responsible for managing fuel injection, ignition timing, and other critical functions. It is located within the engine bay. The unit has dimensions of 0.185m x 0.17m x 0.04m and weighs 0.759kg. Genuine OEM control units are essential for ensuring the correct firmware, sensor calibration, and signal characteristics required for reliable engine operation and emissions compliance.