Genuine OEM Volkswagen Control Unit for Diesel Engines, part number 04B997027B. This electronic control module manages diesel engine operations. It is typically located within the engine bay. The unit has dimensions of 0.185m x 0.183m x 0.035m and weighs 0.767kg. Genuine OEM electronic control units are crucial for ensuring correct firmware, sensor calibration, and overall system compatibility, guaranteeing reliable engine operation.