Genuine OEM Audi Exhaust Gas Temperature Sensor, part number 8W0919529B. This vital sensor is responsible for precisely measuring the temperature of the exhaust gases as they exit the engine. The data it provides is critical for the engine control unit to optimize fuel mixture, manage catalytic converter efficiency, and ensure proper emissions control. It is typically located within the exhaust system, often before or after catalytic converters. The sensor weighs approximately 0.089 kg. Choosing a genuine OEM sensor ensures accurate readings, correct signal characteristics, and robust construction to withstand extreme exhaust temperatures, which are essential for engine performance and compliance.