Genuine OEM Volkswagen Control Unit, part number 03C906026BT350. This is an engine control module that manages various engine functions. Its precise calibration ensures optimal performance and emissions. The unit is approximately 0.205m long, 0.18m wide, and 0.04m high, weighing 0.88kg. Genuine OEM control units are critical for correct engine operation as they contain specific firmware and sensor calibration required for the vehicle's systems.