Engine Coolant Temperature Sensor Removal/Installation

Disconnect negative battery cable.
Partially drain the cooling system. See ENGINE COOLANT REPLACEMENT - 3.0L for 3.0L or see ENGINE COOLANT REPLACEMENT - 4.0L for 4.0L.
Disconnect engine coolant temperature (ECT) sensor connector.
NOTE:
- The 2.3L engine has a CHT sensor. See CYLINDER HEAD TEMPERATURE (CHT) SENSOR REMOVAL/INSTALLATION - 2.3L .
Remove the ECT sensor.

Fig 1: Removing ECT Sensor - 3.0L
Courtesy of MAZDA MOTORS CORP.

Fig 2: Removing ECT Sensor - 4.0L
Courtesy of MAZDA MOTORS CORP.
Install in reverse order of removal.
1. Tightening torque
  1. 16-24 N.m (1.6-2.4 kgf.m, 12-17 ft.lbs)