ECT Sensor No. 1

WARNING: This page is about a different car, the 2018 Mazda CX-5. However, it is still accessible from the selected car via links, so may be relevant.

Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION .)
Drain the engine coolant. (See Engine Coolant Replacement .)
Lift up the vehicle.
Remove the front under cover No. 2. (See FRONT UNDER COVER NO. 2 REMOVAL/INSTALLATION .)
Disconnect the ECT sensor connector.
Remove the ECT sensor No. 1 using the SST.

Fig 1: Removing ECT Sensor No. 1 Using SST With Torque Specifications
Courtesy of MAZDA MOTORS CORP.
Install in the reverse order of removal.
Refill the engine coolant. (See Engine Coolant Replacement .)