1. Park the car. Turn off the engine and allow it to cool completely.
2. Locate the oxygen sensor. The O2 sensors are located on the exhaust manifold, just before the catalytic converter. If you have a V6 engine, there will be two sensors, one on each side.
3. Check the wires. Check the wires that connect the oxygen sensor to the engine. Make sure they are not loose or disconnected.
4. Disengage sensor plug. Pull down on the tab on the sensor connector to disconnect it from the sensor.
5. Remove the oxygen sensor. Use an O2 sensor wrench to turn the oxygen sensor counterclockwise until it comes loose and you can remove it. Be careful not to damage the threads on the sensor or in the exhaust manifold.
6. Install a new oxygen sensor. Apply a small amount of anti-seize lubricant to the threads of the new oxygen sensor before installing it. Tighten the sensor clockwise until it is snug.
7. Connect the sensor plug. Push the sensor connector onto the sensor until it clicks into place.
8. Start the engine and let it run for a few minutes. The engine may run rough for a few minutes as the oxygen sensor heats up and initializes.
9. Check the engine light. If the engine light is still on, there may be a problem with the oxygen sensor or the engine management system. You should have the car diagnosed by a mechanic if the engine light is still on after a few days of driving.
