Genuine OEM Volkswagen Engine Control Unit, part number 0EA906016S. This unit is the central computer that controls and monitors various engine functions, managing fuel injection, ignition timing, and emissions. It is typically located within the engine bay or passenger compartment. The unit has dimensions of 0.185m x 0.155m x 0.05m and weighs 0.606kg. Precise calibration and firmware are essential for correct engine operation, making genuine OEM parts vital for maintaining factory performance and reliability.