To remove and replace the oxygen sensors on a 2004 Ford F150, you will need to follow these steps:

Locate the oxygen sensors on your vehicle. An upstream oxygen sensor is located before the catalytic converter in the exhaust system, while a downstream oxygen sensor is located after the catalytic converter. The upstream sensor monitors the amount of oxygen in the exhaust before it reaches the catalytic converter and is used to adjust the air/fuel mixture to ensure optimal combustion. The downstream sensor monitors the amount of oxygen in the exhaust after it has passed through the catalytic converter and is used to ensure that the converter is working properly.

Use a 7/8 socket wrench to remove the sensor from the exhaust pipe.
Once the sensor is removed, use a wire brush to clean the threads on the exhaust pipe. This will ensure a tight seal for the new sensor.
Install the new sensor with thread sealant and thread it into the exhaust pipe by hand.
Use the socket wrench to tighten the sensor to the exhaust pipe. Be sure not to overtighten the sensor, as this can cause damage.
Reconnect the wiring to the sensor.
Repeat the process for any additional sensors that need to be replaced.

Once all the sensors are replaced, start the engine and check for any error codes or warning lights. If all is well, the repair is complete.

It is always best to refer to the vehicle owner's manual for specific instructions and to seek professional help if you are not familiar or not comfortable with this task.

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