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.
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HOMESERVICE MANUALSMERCURY2010MOUNTAINEER 2WD V8-4.6LREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSOXYGEN SENSORSERVICE AND REPAIRCATALYST MONITOR SENSOR
2010 Mercury Mountaineer 2WD V8-4.6L
Catalyst Monitor Sensor
2010 Mercury Mountaineer 2WD V8-4.6LSECTION Catalyst Monitor Sensor
Catalyst Monitor Sensor
Removal
1. With the vehicle in NEUTRAL, position it on a hoist. For additional information, refer to Vehicle Jacking and Lifting.
2. If the RH Catalyst Monitor Sensor (CMS) is being serviced, remove the 2 bolts and position the heat shield aside.
3. Disconnect the CMS electrical connector.
4. NOTE: If necessary, lubricate the CMS with penetrating and lock lubricant to ease removal.
Using the Exhaust Gas Oxygen Sensor Socket, remove the CMS.
Installation
1. Apply a light coat of 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.
- Using the Exhaust Gas Oxygen Sensor Socket, tighten to 41 Nm (30 lb-ft).
3. Connect the CMS electrical connector.
4. If the RH CMS is being serviced, position the heat shield and install the 2 bolts.
- Tighten to 20 Nm (177 lb-in).
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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.