ECT Sensor No. 1

WARNING: This page is about a different car, the 2016 Mazda CX-3. However, it is still accessible from the selected car via links, so may be relevant.

Disconnect the negative battery cable. (Refer to NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION .)
Drain the engine coolant. (Refer to ENGINE COOLANT REPLACEMENT .)
Pull out the evaporative hose No. 1 from the catch tank and set it aside.

Fig 1: Pulling Out Evaporative Hose From Catch Tank
Courtesy of MAZDA MOTORS CORP.
While pressing the clip tabs in the direction of the arrows (1) shown in the figure, push out the clip in the direction of the arrow (2) shown in the figure and remove the clip.

Fig 2: Pushing Out Clips
Courtesy of MAZDA MOTORS CORP.
Disconnect the ECT sensor No. 1 connector.
Remove the ECT sensor No. 1 using the SST .

Fig 3: Removing ECT Sensor
Courtesy of MAZDA MOTORS CORP.
Install in the reverse order of removal.
Refill the engine coolant. (Refer to ENGINE COOLANT REPLACEMENT .)