How do you fix a faulty external temperature sensor on a Volvo S80?

To fix a faulty external temperature sensor on a Volvo S80, first locate the sensor, typically found near the front grille or behind the bumper. Disconnect the electrical connector and remove the sensor from its mounting. Replace it with a new sensor, reconnect the electrical connector, and test the system to ensure accurate temperature readings. If issues persist, check the wiring for damage or corrosion.