How do you change a coolant sensor on a Fiat punto?

To change the coolant sensor on a Fiat Punto, first ensure the engine is cool and disconnect the battery. Locate the coolant temperature sensor, usually near the thermostat housing, and unplug the electrical connector. Use a suitable wrench to remove the old sensor and install the new one, tightening it securely. Finally, reconnect the electrical connector and the battery, then check for leaks and ensure the sensor is functioning properly.