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.

2009 Acura RDXFACTORY OEM SERVICE PROCEDURE

ECT Sensor 1 Replacement: Notes

Drain the engine coolant (see COOLANT CHECK ).
Remove the air cleaner (see AIR CLEANER REMOVAL/INSTALLATION ).
Remove the charge air cooler (see REMOVAL ).
Remove the ignition coil cover (A) and bolt (B).

Fig 1: Identifying Ignition Coil Cover And Bolt
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Disconnect the ignition coil connectors (C), CMP sensor A connector (D), CMP sensor B connector (E), and the EVAP canister purge valve connector (F).
Remove the harness holder (G).
NOTE: Be careful not to damage the ECT sensor 1 harness.
Disconnect the ECT sensor 1 connector (A).

Fig 2: Identifying ECT Sensor 1 And Connector
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Remove ECT sensor 1 (B).
Install the parts in the reverse order of removal with a new O-ring (C), then refill the radiator with engine coolant (see COOLANT CHECK ).

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.