Genuine OEM Volkswagen Control Unit, part number 03L906018QD350. This unit is the primary control module for the diesel engine, managing fuel injection, emissions, and other critical engine functions. It is located within the engine bay assembly. The unit weighs approximately 0.88 kg and has dimensions of 0.205m x 0.18m x 0.04m. Genuine OEM control units are essential for precise engine calibration and reliable operation, ensuring the correct firmware and sensor integration.