Genuine OEM Audi Exhaust Gas Recirculation (EGR) Valve, part number 038131501BB. This valve precisely controls the flow of exhaust gases back into the engine's intake system, effectively reducing nitrogen oxide (NOx) emissions. It is typically mounted on the engine, connecting the exhaust and intake manifolds. This compact and lightweight valve ensures optimal emissions control. Choosing a genuine OEM EGR valve guarantees correct calibration and material resistance to high temperatures and corrosive exhaust gases, ensuring long-term emissions compliance and engine performance.