2024 Mazda 3 Preferred, 4D HatchbackFACTORY OEM SERVICE PROCEDURE

Engine Coolant Temperature (ECT) Sensor Removal/Installation

Special Service Tool (SST) 

49 D015 001
Box wrench
G16786929Courtesy of MAZDA MOTORS CORP.

Replacement Part 

Washer
Quantity: 1
Location of use: ECT sensor
WARNING:
  • A hot engine can cause severe burns. Turn off the engine and wait until it is cool before removing the ECT sensor.
  1. Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION .)
  2. Remove the front under cover No. 2. (See FRONT UNDER COVER No. 2 REMOVAL/INSTALLATION .)
  3. Remove the front under cover No. 1. (See FRONT UNDER COVER No. 1 REMOVAL/INSTALLATION .)
  4. Drain the engine coolant. (See ENGINE COOLANT REPLACEMENT [SKYACTIV-G (WITH CYLINDER DEACTIVATION)] .)
  5. Disconnect the ECT sensor connector.
  6. Remove the ECT sensor No. 1 using the SST.
    Fig 1: ECT Sensor With Torque Specifications
    G15654593Courtesy of MAZDA MOTORS CORP.
  7. Install in the reverse order of removal.
  8. Refill the engine coolant. (See ENGINE COOLANT REPLACEMENT [SKYACTIV-G (WITH CYLINDER DEACTIVATION)] .)
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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.