To replace the sensor, you will need a soldering iron.
Removal

Fig. Removing the Mirror Glass
Remove the mirror glass using a special tool (Cag. 1363) (Fig. 1).

Fig. 2. Removing the mirror housing: 1 - tabs
Remove the mirror housing by pressing on the tabs (Fig. 2).
Disconnect the sensor from the bracket.

Fig. 3. Removing the sensor from the bracket
Cut the wires (Fig. 3).
Installation
Solder the two temperature sensor wires.
Insulate the two sensor wires with heat shrink sleeves.
Install the mirror housing.