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 Ford Ranger 2WD L4-2.3LFACTORY OEM SERVICE PROCEDURE
Catalyst Monitor Sensor
Catalyst Monitor Sensor
Removal
1. With the vehicle in NEUTRAL, position it on a hoist. For additional information, refer to Jacking and Lifting Service and Repair.
2. Disconnect the Catalyst Monitor Sensor (CMS) electrical connector.
3. NOTE: If necessary, lubricate the CMS with lock lubricant to assist in removal.
Using the Exhaust Gas Oxygen Sensor Socket, remove the CMS.
Installation
1. Apply a light coat of nickel anti-seize lubricant to the threads of the CMS.
2. Using the Exhaust Gas Oxygen Sensor Socket, install the CMS.
- Calculate the correct torque wrench setting for the following torque. Refer to the Torque Wrench Adapter Formulas in the Appendix.
- Using the Exhaust Gas Oxygen Sensor Socket, tighten to 48 Nm (35 lb-ft).
3. Connect the CMS electrical connector.
Factory Service Tools
Use the Manual With the Right Hardware
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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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