Genuine OEM Volkswagen Control Unit, part number 03C906026CJ. This control unit is essential for managing the petrol engine's various functions, including fuel injection, ignition timing, and emissions control. It is typically mounted in the engine bay. The unit weighs approximately 0.88 kg and has dimensions of 0.205m x 0.18m x 0.04m. Genuine OEM control units are crucial for ensuring the correct firmware, sensor calibration, and signal characteristics, which are vital for reliable engine operation and longevity.