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First you need to determine which O2 sensor needs to be replaced, there could be up to 4 of them if you have duel exhaust. A bad O2 sensor would illuminate the check engine light in which case the code(s) stored would lead you to the faulty sensor.
Once you have determined which O2 sensor needs to be replaced, unplug the O2 sensor harness from the vehicles harness. If you are replacing the sensor with a new one go ahead and cut the wires off of the old sensor. This will allow you to slip a 7/8" box wrench over the sensor to remove it CCW. Install the new sensor and tighten it with a 7/8" open end wrench and tighten as you would a spark plug. No need to over tighten it. Reconnect the new O2 sensor to the vehicles harness, done.
What else can I help you with?
How do you replace a 1999 Ford Expedition horn?
with a wrench
How do you replace the spark plugs on a 1999 ford expedition?
thanks
How do you check if the ABS sensor is working on a 1999 Ford Expedition What can you do?
how do you check the abs sensor on a 1998 contour
How do you replace ball joints on a 1999 ford expedition?
which ones? upper or lower?
Where is the speed sensor on a 2001 Ford Expedition?
Speed sensor on a 2001 ford expedition
Where is located Ford Expedition 1999 relays?
where is located ford expedition 1999 relays
What is the easiest way to replace a ball joint on a 1999 Ford Expedition?
pay someone else to do it
How do you replace the oxygen sensor on a 1999 Ford Expedition 4.6L?
LOCATE THE SENSOR IN QUESTION THEN WARM THE ENGINE SLIGHTLY TO MAKE REMOVAL OF THE 92 SENSOR EASIER THEN USING A 02 SOCKET OR 7/8 WRENCH LOOSEN THE 02 SENSOR AND REMOVE IT ALSO DISCONNECT THE WIRING CONNECTOR.
ObdII code P0113 for a 1999 Ford Expedition 5.4?
IAT Sensor 1 Circuit High Input
Where is speed sensor on 2000 Ford Expedition 5.4?
where is the speed sensor on my 2000 ford expedition v8 5.4 motor
How do you replace a radiator support on 2003 Ford Expedition?
How do you replace a radiator on 2003 ford expedition?
Where is mass airflow sensor located on 1999 expedition?
On a 1999 Ford Expedition : The Mass Air Flow sensor is between the engine air filter and the large diameter engine air intake tube ( it is INSIDE a round shaped plastic housing )
