Genuine OEM Volkswagen Engine Control Unit (ECU), part number 06A906070. This electronic control unit is the brain of the engine management system, responsible for monitoring various sensors and controlling fuel injection, ignition timing, and other critical engine parameters for optimal performance and emissions. The unit is located in the engine bay. Genuine OEM ECUs are programmed with the correct firmware and calibration specific to the vehicle's engine, ensuring precise control and reliable operation.