Genuine OEM Volkswagen Control Unit For Four-Wheel Drive, part number 02D900554C. This electronic module is responsible for managing and regulating the power distribution to the front and rear axles in a four-wheel-drive system. It ensures optimal traction and stability under various driving conditions. Weighing 0.73 kg, this control unit is vital for the drivetrain's performance. Genuine OEM electronic components guarantee correct firmware and calibration for seamless integration.