Genuine OEM Volkswagen Exhaust Gas Temperature Sender, part number 03G906088D. This sensor measures exhaust gas temperature in the exhaust system. It is typically located in the exhaust manifold or downpipe before the catalytic converter. Accurate temperature readings are crucial for the engine control unit (ECU) to optimize fuel injection, ignition timing, and emissions control systems. The exact calibration of genuine OEM sensors ensures optimal performance and longevity.