Genuine OEM Audi Engine Breather Line, part number 4G0121081CC. This critical component is responsible for safely venting crankcase gases, preventing pressure buildup within the engine and ensuring proper lubrication and emissions control. It is typically routed from the crankcase or valve cover to the intake system. This line measures approximately 0.88 meters in length and weighs about 0.06 kg. Using a genuine OEM breather line ensures the correct material flexibility, heat resistance, and precise routing geometry, which are essential for preventing leaks, maintaining engine cleanliness, and complying with emissions standards.

Catalogue entry: PIPE front center.