Genuine OEM Audi Secondary Air Pump, part number 04E131333A. This pump is a key component of the vehicle's emissions control system, responsible for injecting fresh air into the exhaust manifold during cold engine starts. This process helps to rapidly warm up the catalytic converter, significantly reducing harmful emissions before the engine reaches optimal operating temperature. It features integrated electrical connections and hose ports for precise installation. Weighing approximately 1.343 kg, this pump is built to factory specifications. Choosing a genuine OEM secondary air pump ensures correct air flow, reliable operation, and proper integration with the engine management system for effective emissions reduction.