Genuine OEM Volkswagen Engine Control Unit, part number 06K906071BQ. This unit is the central computer for the engine, responsible for managing fuel injection, ignition timing, and other critical functions to ensure optimal performance and emissions. It is typically located within the engine bay. The unit weighs approximately 0.911 kg. Genuine OEM ECUs are programmed with specific firmware and calibration data essential for the vehicle's engine to operate correctly and efficiently.