Park your car in a safe place with a level surface. Open the hood and disconnect the black, negative battery cable.
Locate the oxygen sensor. Following the exhaust pipe connected to the exhaust manifold, you will find the sensor threaded into the pipe, just before the catalytic converter. On some models, you will find a second oxygen sensor mounted on the other side of the catalytic converter.
Raise the front of the vehicle if you need more room to reach or have access to the sensor. Use a floor jack and safely support the vehicle on two jack stands.
Unplug the O2S sensor electrical connector. Press the lock tab or tabs and separate the connector.
Remove the oxygen sensor using a ratchet and oxygen sensor socket. Some sensors are hard to remove below 100 degrees F. If you find it hard to remove the unit in your vehicle, you have two options. Warm up the engine to operating temperature and remove the sensor. Or apply penetrating oil to the sensor threads following the product manufacturer's instructions.
Apply anti-seize compound to the threads of the new oxygen sensor. Start the sensor into the exhaust pipe by hand to avoid damage to the threads. Tighten the sensor using the ratchet and oxygen sensor socket.
Plug the sensor electrical connector, lower the vehicle and connect the black, negative battery cable.
Saturday, October 23rd, 2010 AT 11:00 PM