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.
2004 Mazda 3 i, AutomaticFACTORY OEM SERVICE PROCEDURE
Engine Coolant Temperature (ECT) Sensor Removal/Installation
- Remove the battery cover.
- Disconnect the negative battery cable.
- Remove the plug hole cover.
- Drain the engine coolant. (See ENGINE COOLANT REPLACEMENT .)
- Disconnect the ECT sensor connector.
- Remove the ECT sensor using the SST.
- Install in the reverse order of removal.
- Tightening torque 10-14 N.m {102-142 kgf.cm, 89-123 in.lbf}
Factory Service Tools
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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.
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