Genuine OEM Audi Secondary Air Pump, part number 022959253A. This electric pump is a key component of the emissions control system, injecting fresh air into the exhaust stream to aid in the oxidation of unburnt hydrocarbons and carbon monoxide. Encased in a durable black plastic housing, it weighs approximately 1.46 kg. Choosing a genuine OEM secondary air pump ensures correct air flow, reliable electrical operation, and compliance with stringent emissions regulations.