Genuine OEM Audi Purge Valve Solenoid, part number 078133517H. This essential valve plays a key role in the vehicle's evaporative emissions system, precisely controlling the flow of fuel vapor from the charcoal canister to the engine for combustion. It helps prevent harmful emissions from escaping into the atmosphere. The solenoid is typically located near the charcoal canister or intake manifold. Using genuine OEM purge valve solenoids ensures accurate electronic calibration and reliable operation, preventing check engine lights and maintaining the vehicle's emissions compliance and fuel efficiency.