Genuine OEM Audi Secondary Air Pump, part number 022959253B. This pump is a critical component of the vehicle's emissions control system, designed to inject fresh air into the exhaust stream. This process aids in the oxidation of unburnt hydrocarbons and carbon monoxide, reducing harmful emissions. Weighing 1.505 kg, this genuine OEM part ensures precise air injection for optimal emissions control and engine performance, maintaining factory standards for environmental compliance.