Abstract: A temperature sensor for a motor vehicle is disclosed. The temperature sensor includes a temperature-sensitive element, two electrical wires connecting the temperature-sensitive element to an electrical connector, an insulating sheath surrounding the two electrical wires, a protective endpiece including a closed end in which the temperature-sensitive element is housed, and a fixing means through which the insulating sheath passes. The fixing means has a threaded element to be screwed into a threaded orifice provided in a vehicle engine interface element to fix the temperature sensor to the engine interface element and a stop fixed to the insulating sheath. The stop surrounds the insulating sheath and provides sealing between the inside of the engine interface element and the outside, the threaded element being capable of rotating with respect to the stop.