Removal & Installation
An oxygen sensor socket/wrench is available from Ford or aftermarket manufacturers to ease the removal and installation of the oxygen sensor(s). If one is not available, an open-end wrench can be used.
The sensor uses a permanently attached pigtail and connector. This pigtail should not be removed from the sensor. Damage or removal of the pigtail or connector will affect the proper operation of the sensor. Keep the electrical connector and louvered end of the sensor clean and free of grease. NEVER use cleaning solvents of any type on the sensor! The oxygen sensor may be difficult to remove when the temperature of the engine is below 120°F (49°C). Excessive force may damage the threads in the exhaust manifold or exhaust pipe.
- Disconnect the negative battery cable.
- Raise and support the vehicle.
- Unplug the electrical connector and any attaching hardware.
Lubricate the sensor with penetrating oil before removal.
- Remove the sensor using an appropriate tool. Special oxygen sensor sockets are available to remove the sensor and can be purchased at many parts stores or where automotive tools are sold. The proper size wrench can be used, most sensors are 7 / 8 inch or 22mm sizes.
- A 22mm crows foot works very well.
- Coat the threads of the sensor with a suitable anti-seize compound before installation. New sensors are treated with this compound.
- Install the sensor and tighten it. Use care in making sure the silicone boot is in the correct position to avoid melting it during operation.
- Attach the electrical connector.
- Lower the vehicle.
- Connect the negative battery cable.