Genuine OEM Audi Diesel Engine Control Unit, part number 04L906056HT8V0. This control unit is responsible for managing the complex operations of the diesel engine, including fuel injection, emissions, and performance parameters. It is typically located within the engine bay or passenger compartment. The unit has a weight of 0.749 kg and dimensions of 0.185m x 0.182m x 0.04m. Genuine OEM electronic control units are critical for ensuring the correct firmware, sensor calibration, and signal characteristics necessary for the engine to operate correctly and efficiently.