Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

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HOMESERVICE MANUALSMAZDA2013MX-5 MIATA GRAND TOURING, AUTOMATIC TRANSREPAIR AND DIAGNOSISENGINE PERFORMANCEENGINE CONTROL SYSTEMSENGINE COOLANT TEMPERATURE (ECT) SENSOR REMOVAL/INSTALLATION

2013 Mazda MX-5 Miata Grand Touring, Automatic Trans

Engine Coolant Temperature (ECT) Sensor Removal/Installation

2013 Mazda MX-5 Miata Grand Touring, Automatic TransSECTION Engine Coolant Temperature (ECT) Sensor Removal/Installation

Remove the battery cover.
Disconnect the negative battery cable. (See BATTERY REMOVAL/INSTALLATION [LF] ).
Drain the engine coolant from the radiator. (See ENGINE COOLANT REPLACEMENT ).
Remove the service hole cover.
1. Remove the suspension tower bar (joint), (right side) and (left side). (See FRONT SUSPENSION TOWER BAR REMOVAL/INSTALLATION ).
2. Remove the wiper arm. (See WIPER ARM AND BLADE REMOVAL/INSTALLATION ).
3. Remove the cowl grille. (See COWL GRILLE REMOVAL/INSTALLATION ).
4. Remove the side cowl grille. (See SIDE COWL GRILLE REMOVAL/INSTALLATION ).
5. Move the cooler pipe No. 3 and heater pipe slightly out of the way.
  
  Fig 1: Identifying Heater Pipe And Cooler Pipe No. 3
  Courtesy of MAZDA MOTORS CORP.
6. Remove the service hole cover.
  
  Fig 2: Service Hole Cover With Torque Specifications
  Courtesy of MAZDA MOTORS CORP.
Disconnect the heater hose and move the heater hose slightly out of the way.
Disconnect the ECT sensor connector.

Fig 3: Identifying Heater Hose
Courtesy of MAZDA MOTORS CORP.
Remove the ECT sensor.
NOTE:
- Put the double nut together and install the torque wrench. (See SERVICE CAUTIONS ).

RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.
• Brakes feel soft, pull hard to one side, or make grinding noises.
• The engine overheats, stalls repeatedly, or misfires under load.
• You are missing required tools, torque specs, or safe lifting equipment.
• You are not confident in the next step or safety outcome.