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.

2017 Mazda 6 Grand TouringFACTORY OEM SERVICE PROCEDURE

ECT Sensor No. 2

Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION .)
Drain the engine coolant. (See ENGINE COOLANT REPLACEMENT .)
Remove the plug hole plate. (See PLUG HOLE PLATE REMOVAL/INSTALLATION .)
Disconnect the ECT sensor No. 2 connector.

Fig 1: Detaching ECT Sensor No. 2 Connector
Courtesy of MAZDA MOTORS CORP.
Disconnect the hoses. (See HOSE CONNECTION NOTE .)

Fig 2: Detaching Hoses
Courtesy of MAZDA MOTORS CORP.
Remove the nut from the water pipe.

Fig 3: Removing Nut From Water Pipe
Courtesy of MAZDA MOTORS CORP.
Move the water pipe in the direction of the arrow shown in the figure to remove it. (See WATER PIPE INSTALLATION NOTE .)

Fig 4: Locating Water Pipe
Courtesy of MAZDA MOTORS CORP.
Remove the ECT sensor No. 2 using the SST.

Fig 5: Removing ECT Sensor
Courtesy of MAZDA MOTORS CORP.
Install in the reverse order of removal.
Refill the engine coolant. (See ENGINE COOLANT REPLACEMENT .)

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.