ECT Sensor No. 1

WARNING: This page is about a different car, the 2017 Mazda 3. However, it is still accessible from the selected car via links, so may be relevant.

Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION .)
Remove the plug hole plate. (See PLUG HOLE PLATE REMOVAL/INSTALLATION .)
Drain the engine coolant. (See ENGINE COOLANT REPLACEMENT .)
Pull out the evaporative hose No. 1 from the catch tank and set it aside.

Fig 1: Removing Evaporative Hose No. 1 From Catch Tank
Courtesy of MAZDA MOTORS CORP.
Remove the clip from the bracket and loosen the wiring harness.

Fig 2: Removing Clip From Bracket
Courtesy of MAZDA MOTORS CORP.
Set the wiring harness aside.

Fig 3: Installing Wiring Harness
Courtesy of MAZDA MOTORS CORP.
Disconnect the ECT sensor No. 1 connector.
Remove the ECT sensor No. 1 using the SST.

Fig 4: 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 .)