ECT Sensor No. 2 (Until 2017MY Except MEXICO)

Disconnect the negative battery terminal. (See REQUIRED PROCEDURE AFTER NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION .)
Drain the engine coolant. (See ENGINE COOLANT REPLACEMENT .)
Remove the plug hole plate. (See PLUG HOLE PLATE REMOVAL/INSTALLATION .)
Disconnect the ECT sensor No. 2 connector.
Remove the ECT sensor No. 2 using the SST.

Fig 1: ECT Sensor No. 2 With Torque Specification
Courtesy of MAZDA MOTORS CORP.
Install in the reverse order of removal.
Refill the engine coolant. (See ENGINE COOLANT REPLACEMENT .)