Genuine OEM Audi Engine Breather Line, part number 0P2103217C. This essential pipe manages crankcase ventilation by routing blow-by gases from the engine's crankcase back into the intake system for re-combustion, preventing pressure buildup and reducing emissions. It is typically located in the engine bay, connecting the crankcase to the intake manifold or turbocharger inlet. Constructed from oil-resistant polymers and rubber, this line measures approximately 0.32m in length. Selecting a genuine OEM breather line ensures correct routing geometry, proper sealing, and resistance to oil vapor and heat, which are crucial for maintaining engine health and emissions compliance.