Genuine OEM Audi Secondary Air Valve, part number 06A131351J. This critical emissions control component is responsible for regulating the flow of fresh air into the exhaust system, particularly during cold engine starts. By injecting air, it helps to rapidly heat the catalytic converter, thereby reducing harmful emissions. This valve is designed for the left side of the engine bay. Weighing 0.249 kg, this genuine OEM valve ensures precise air flow control and reliable operation, which is essential for maintaining optimal engine performance and compliance with emissions standards.