Genuine OEM Volkswagen Control Unit for Diesel Engines, part number 04L906021AH. This electronic control module is responsible for managing various engine functions, ensuring optimal performance and efficiency. It is a critical component for the diesel engine's operation. The part is approximately 0.185m long, 0.17m wide, and 0.04m high. Genuine OEM control units are essential for correct firmware and sensor calibration, ensuring reliable engine management.