Genuine OEM Volkswagen Diesel Engine Control Unit, part number 05L906022KH2GA. This unit is responsible for managing the diesel engine's combustion process, fuel injection, and emissions control systems. It is typically located within the engine bay. The unit has dimensions of 0.205m x 0.18m x 0.04m and weighs 0.986 kg. Genuine OEM engine control units are critical for ensuring the correct firmware and sensor calibration, which directly impacts engine performance, fuel economy, and emissions compliance.