Genuine OEM Volkswagen Exhaust Gas Temperature Sender, part number 03L906088HD. This sensor measures the temperature of the exhaust gases exiting the engine. It is typically located in the exhaust system before or after a catalytic converter. Accurate temperature readings are crucial for the engine control unit to optimize fuel injection, ignition timing, and emissions system operation. Genuine OEM parts are manufactured to exact specifications for precise calibration and reliable performance in demanding exhaust conditions.