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.
2011 Mazda CX-9 AWD V6-3.7LFACTORY OEM SERVICE PROCEDURE
Engine Temperature Sensor: Service and Repair
CYLINDER HEAD TEMPERATURE (CHT) SENSOR REMOVAL/INSTALLATION [MZI-3.7]
NOTE:
- Do not reuse the CHT sensor, install a new sensor.
1. Disconnect the negative battery cable. Removal and Replacement
2. Perform the following procedure for easier access.
a. Remove the ventilation hose. Quick Release Connector Removal/Installation
b. Remove the vacuum hose (to purge solenoid valve). Quick Release Connector Removal/Installation
c. Remove the fuel hose. Quick Release Connector Removal/Installation
d. Remove the fuel distributor. Service and Repair
e. Remove the intake manifold. Service and Repair
3. Disconnect the CHT sensor connector.
4. Remove the CHT sensor using the following tools:
- Socket
3/8", 20 mm, 6 point
- Ratchet handle and torque wrench
3/8" Drive
5. Install in the reverse order of removal.
Tightening torque
- 9-10 Nm {92-101 kgf-cm, 80-88 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.