Genuine OEM Volkswagen Engine Control Unit Otto, part number 06J906026FN. This unit is the central computer for the engine, responsible for managing fuel injection, ignition timing, and other critical functions to ensure optimal performance and emissions. It is typically located in the engine bay. The unit weighs approximately 0.913 kg and has dimensions of 0.205m x 0.18m x 0.04m. Genuine OEM ECUs are essential for ensuring the correct firmware and sensor calibration, guaranteeing reliable engine operation and factory-set performance.