Genuine OEM Volkswagen Control Unit For Diesel Engine, part number 04L997016D. This electronic control module manages various functions of the diesel engine. It is typically located within the engine bay. The unit has dimensions of 0.205m x 0.18m x 0.04m and weighs 0.824 kg. Genuine OEM control units are essential for correct firmware and sensor calibration, ensuring reliable engine operation and compliance with emissions standards.