Genuine OEM Audi Lambda Sensor, part number 03L906262B. This sensor measures the oxygen content in the exhaust gases, providing critical data to the engine control unit for optimal fuel-air mixture. It is installed in the exhaust system. The sensor features a durable construction designed for high temperatures and harsh exhaust environments. Genuine OEM lambda sensors are precisely calibrated to ensure accurate readings, which is vital for maintaining engine efficiency, reducing emissions, and preventing check engine lights.