Genuine OEM Volkswagen Secondary Air Injection Pump, part number 04E959231E. This pump is a key component of the emissions control system, designed to inject fresh air into the exhaust manifold to assist in the catalytic converter's operation and reduce pollutants. It is integrated into the vehicle's exhaust gas treatment system. Weighing 1.324 kg, this genuine OEM pump ensures precise air delivery and pressure, critical for maintaining emission compliance and optimal engine function.