1. Turn off the ignition and allow the car to cool down for a few minutes.
2. Locate the OBD-II port under the dashboard, usually near the steering wheel. It's a 16-pin port.
3. Connect a code reader or scanner to the OBD-II port. Make sure the code reader is compatible with your vehicle's model and year.
4. Turn on the ignition without starting the engine ("ON" position).
5. Follow the prompts on the code reader to retrieve and read the trouble codes stored in the vehicle's computer. Write down these codes for reference.
6. Once you have the trouble codes, refer to a repair manual or online resource to determine what the codes mean and what repairs or maintenance may be needed.
7. If the code reader offers a reset or clear function, use it to erase the codes from the vehicle's computer.
8. Turn off the ignition and disconnect the code reader.
9. Start the car and observe if the Check Engine Light remains off.
Note: If the Check Engine Light comes back on after clearing the codes, this indicates a persistent issue that needs to be addressed. In that case, it's best to seek further diagnosis from a qualified mechanic or an authorized Mazda dealership.
