Genuine OEM Audi Exhaust Gas Recirculation (EGR) Valve, part number 04L131501B. This critical component precisely controls the flow of exhaust gases back into the engine's intake system, reducing nitrogen oxide (NOx) emissions. It is typically located within the engine bay, often near the exhaust manifold or intake system. Constructed from durable metal and high-temperature resistant plastics, it ensures longevity and consistent performance. Genuine OEM EGR valves provide exact calibration and signal characteristics, crucial for maintaining optimal engine performance and meeting stringent emissions standards.