Genuine OEM Volkswagen Secondary Air Valve, part number 022131101F. This valve is an integral part of the emissions control system, regulating the flow of fresh air into the exhaust stream to aid in the oxidation of unburnt hydrocarbons and carbon monoxide. It is typically located near the exhaust manifold. Constructed from durable metal and plastic components, it weighs approximately 0.257 kg. A genuine OEM valve ensures precise air flow control and reliable operation, critical for meeting emissions standards and maintaining engine performance.