Genuine OEM Volkswagen Control Unit for Diesel Engine, part number 03L906018BC. This is the main engine control module responsible for managing engine performance and emissions. It is typically located in the engine bay. This unit weighs approximately 0.88 kg and measures 0.205m x 0.18m x 0.04m. As a critical electronic component, genuine OEM quality guarantees correct firmware and sensor calibration, ensuring reliable engine operation.