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Home >> Mercury >> 2005 >> Mountaineer 2WD V8-4.6L SOHC VIN W >> Repair and Diagnosis >> Powertrain Management >> Sensors and Switches - Powertrain Management >> Sensors and Switches - Computers and Control Systems >> Oxygen Sensor >> Service and Repair >> Heated Oxygen Sensor (HO2S)

Heated Oxygen Sensor (HO2S)

HEATED OXYGEN SENSOR (HO2S)







Exploded View


Socket, Exhaust Gas Oxygen Sensor:






Special Tool(s)

Removal and Installation
1. With the vehicle in NEUTRAL, position it on a hoist.
2. If the RH heated oxygen sensor (HO2S) is being serviced, remove the bolts and position the heat shield aside.
- To install, tighten to 20 Nm (15 lb-ft).

3. Disconnect the HO2S electrical connector.







4. NOTE: If necessary, lubricate the HO2S with penetrating and lock lubricant to ease removal.

Using the special tool, remove the HO2S.
- To install, tighten to 41 Nm (30 lb-ft).

5. To install, reverse the removal procedure.
- Apply a light coat of nickel anti-seize lubricant to the threads of the HO2S.