Genuine OEM Nissan engine coolant temperature sensor, part number 22630ZJ70A. This sensor accurately measures the engine's coolant temperature, sending critical data to the engine control unit (ECU) to manage fuel injection, ignition timing, and cooling fan operation. It is typically installed in the engine block or cylinder head where it is in contact with the coolant. Genuine OEM sensors are calibrated to exact specifications for reliable and precise temperature readings, ensuring optimal engine performance and efficiency.