Genuine OEM Volkswagen Control Unit For Diesel Engine, part number 03L906012D. This is the main engine control module responsible for managing various engine functions. It is typically located within the engine bay. This unit has a weight of 0.916 kg and dimensions of 0.205m x 0.182m x 0.04m. Genuine OEM engine control units are critical for ensuring the correct firmware and sensor calibration, which is essential for optimal engine performance and longevity.