O2 sensors, or oxygen sensors, control the fuel and air mixture in your Jeep's combustion engine. The sensor reads the amount of oxygen in your exhaust gas and determines if the car is running lean or rich, and sends a signal back to the computer, which in turn adjusts the air/fuel mixture. O2 sensors are important pieces of equipment on your car, and should be maintained just like any other part of the car. Sometimes O2 sensors will go bad and cause your engine to run extremely rough or not at all. Fixing this problem is often as simple as replacing the O2 sensor with a new one and restarting the car. Replacing an O2 sensor is not difficult, and can be done in as little as 10 minutes.
Pop the hood and locate the oxygen sensor. It is installed on the Jeep's exhaust manifold, which exits on the right of the engine for the straight 6-cylinder engine, and the rear for the 4-cylinder engine.
Unplug the wiring harness from the back of the O2 sensor and lay it aside. Attach the oxygen sensor socket to the ratchet, and then use it to loosen and remove the old O2 sensor.
Screw the new O2 sensor into the sensor hole finger tight, and then use the ratchet to tighten it down. Reattach the wiring harness to the back of the oxygen sensor, and then close the hood and turn the Jeep on. Listen for a smooth idle and continuous power when you give it the gas.
