Genuine OEM Volkswagen Control Unit For Diesel, part number 03L997030Q. This electronic control module is responsible for managing various functions of the diesel engine. It is typically located within the engine bay. The module has dimensions of 0.205m x 0.182m x 0.04m and weighs 0.91 kg. Genuine OEM electronic control units are essential for ensuring correct firmware, sensor calibration, and overall system integrity.