What type of sensor measures the temperature of the engine coolant?

The coolant temperature sensor is specifically designed to measure the temperature of the engine coolant. This sensor plays a crucial role in monitoring the engine's operating temperature, which helps ensure that the engine runs efficiently and prevents overheating. By providing real-time temperature readings, the coolant temperature sensor allows the engine control unit to adjust fuel injection, ignition timing, and other parameters to optimize performance and reduce emissions.

In contrast, the other options serve different functions: the oil pressure sensor monitors the pressure of the oil circulating through the engine, the mass air flow sensor measures the amount of air entering the engine for proper air-fuel mixture, and the throttle position sensor tracks the position of the throttle valve to control engine power output. Each of these sensors contributes to engine management but does not specifically measure coolant temperature, reinforcing the importance of the coolant temperature sensor in maintaining engine health.