How do you change coolant sensor on a 2002 Celica Gt?

To change the coolant temperature sensor on a 2002 Celica GT, start by disconnecting the negative battery terminal to ensure safety. Locate the sensor, which is typically found near the thermostat housing, and unplug the electrical connector. Use a socket or wrench to remove the old sensor, then install the new one by threading it in and tightening it securely. Finally, reconnect the electrical connector and the battery terminal, and check for any leaks after refilling the coolant if needed.