1. Disconnect the battery. This will prevent any electrical shock while you are working on the sensor.
2. Locate the air-fuel sensor. The sensor is usually located in the exhaust manifold near the engine. It will have a wire attached to it.
3. Disconnect the wire from the sensor.
4. Remove the sensor from the exhaust manifold. You will need to use a wrench to loosen the bolts that hold the sensor in place.
5. Inspect the sensor for damage. If the sensor is cracked or damaged, it will need to be replaced.
6. Clean the sensor with a solvent. You can use a carburetor cleaner or a similar product to clean the sensor.
7. Reinstall the sensor in the exhaust manifold. Tighten the bolts that hold the sensor in place.
8. Reconnect the wire to the sensor.
9. Reconnect the battery.
10. Start the engine and let it run for a few minutes. This will allow the sensor to heat up and begin working.
If you have followed all of these steps and the sensor is still not working, you will need to take the vehicle to a mechanic for further diagnosis.
