Genuine OEM BMW Exhaust Temperature Sensor, part number 13627822261. This sensor is designed to measure the temperature of the exhaust gases. This information is critical for the engine control unit (ECU) to manage engine performance, optimize fuel injection, and prevent damage from excessive heat. It is typically installed in the exhaust manifold or downpipe. Genuine OEM parts ensure accurate temperature readings and reliable operation, contributing to the longevity and efficiency of the engine and exhaust system.