Genuine OEM Audi Secondary Air Injection Hose, part number 8T0133817F. This hose is a key component of the vehicle's emissions control system, responsible for transporting fresh air to the exhaust stream during cold starts. This process helps to reduce harmful emissions by promoting catalytic converter efficiency. The hose is made from durable, corrugated plastic/rubber, designed for flexibility and resistance to engine bay conditions. Weighing 0.111 kg and measuring 0.59m in length, it ensures precise routing and connection. Using a genuine OEM hose guarantees correct fitment, material integrity, and optimal performance of the secondary air injection system.