Genuine OEM Audi Engine Control Unit Otto, part number 4E1910018K. This unit is the central computer for the engine, responsible for managing fuel injection, ignition timing, and other critical functions. It is typically located in the engine bay. The unit has dimensions of 0.185m x 0.17m x 0.04m and weighs 0.746kg. Genuine OEM engine control units are essential for precise calibration and factory-specified performance, ensuring the engine operates reliably and efficiently.