ECT Sensor No. 1

WARNING: This page is about a different car, the 2017 Mazda CX-9. 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 .)
Remove the following parts:
1. Plug hole plate (See PLUG HOLE PLATE REMOVAL/INSTALLATION .)
2. Battery (See BATTERY REMOVAL/INSTALLATION .)
3. Air inlet pipe (See INTAKE-AIR SYSTEM REMOVAL/INSTALLATION .)
Disconnect the ECT sensor No. 1 connector.
Remove the ECT sensor No. 1 using the SST.

Fig 1: Removing ECT Sensor No. 1 Using SST
Courtesy of MAZDA MOTORS CORP.
Install in the reverse order of removal.
Refill the engine coolant. (See ENGINE COOLANT REPLACEMENT .)