F 150 Heritage 4WD Pickup V8-5.4L CNG VIN M (2004)
Oxygen Sensor: Service and Repair
Rear Heated Oxygen Sensor
HEATED OXYGEN SENSOR (HO2S) - REAR
Socket, Exhaust Gas Oxygen Sensor
SPECIAL TOOL(S)
REMOVAL
WARNING: The normal operating temperature of the exhaust system is very high. Never attempt to service any part of the system until it has
cooled. Be especially careful when working around the three way catalytic converter. The temperature of the three way catalytic converter
rises to a high level after only a few minutes of engine operation. Failure to follow these instructions may result in personal injury.
1. Disconnect the battery ground cable.
2. Raise and support the vehicle.
3. Disconnect the heated oxygen sensor (HO2S) electrical connector.
4. Use the special tool and remove the HO2S.
INSTALLATION
1. NOTE: Apply a light coat of High Temperature Nickel Anti-Seize Compound F6AZ-9L494-AA or equivalent meeting Ford specification
ESE-M12A4-A to the threads of the HO2S.
To install, reverse the removal procedure.
