1. Purchase an OBD II scanner. This is a device that can read and clear diagnostic codes from your vehicle's computer. You can purchase an OBD II scanner online or at most auto parts stores.
2. Connect the OBD II scanner to your vehicle's diagnostic port. This is usually located under the dashboard on the driver's side.
3. Turn on the OBD II scanner and follow the instructions on the screen. The scanner will read the diagnostic codes from your vehicle's computer and display them on the screen.
4. Find the diagnostic code that corresponds to the engine light. This will usually be a code that starts with "P0."
5. Look up the meaning of the diagnostic code online. This will tell you what the problem is and how to fix it.
6. Once you have fixed the problem, clear the diagnostic code from the vehicle's computer. You can do this by following the instructions on the OBD II scanner.
7. The engine light should now be turned off. If it is not, you may need to take your vehicle to a mechanic to have it repaired.
