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How to Change the Oxygen Sensor in a 1999 Ford Explorer

When an oxygen sensor fails in your 1999 Ford Explorer, it is like pouring money into your gas tank. Your gas mileage will decrease substantially, and your Check Engine light may illuminate. If you have a bad oxygen sensor, you should replace it right away. One sensor is located on each side of the exhaust manifold. You can buy new sensors at an auto parts store.

Instructions

1

Lift the truck with a jack and secure it on jack stands. Move the jack out of the way once the truck is stable on the jack stands.

2

Pull the wiring harness connection apart at the top of the oxygen sensor. The connector will simply pull apart.

3

Remove the oxygen sensor with an oxygen sensor socket and ratchet. Discard the old sensor as you will no longer need it.

4

Insert the new sensor, threading it by hand to start it. Torque it to 30 pound-feet with your torque wrench.

5

Press the wiring harness connection into place on the new sensor. The connector should click when it engages fully.

6

Repeat the steps on the remaining oxygen sensor if necessary. Raise the truck with the jack enough to remove the jack stands. Return the truck to the ground.