Genuine OEM Volkswagen Control Unit, part number 03L906018FQ5N0. This electronic control module is designed for diesel engines, managing critical functions such as fuel injection, ignition timing, and emissions control to optimize performance and efficiency. It is typically mounted in a protected location within the engine bay. The dimensions are approximately 0.205m x 0.18m x 0.04m and it weighs 0.88 kg. Genuine OEM control units are essential for ensuring the correct firmware, calibration, and sensor compatibility required for reliable engine operation.