How to Run Tests on a Car for Check Engine Light

The check engine light is one of the most dreaded sights for any driver. It can be a sign of a minor issue, such as a loose gas cap, or it can indicate a more serious problem, such as a failed emissions control system. If you see the check engine light come on, it’s important to have it checked out as soon as possible.

There are a few different tests that you can run on your car to help identify the cause of the check engine light. These tests can be performed using a simple code reader or a more advanced diagnostic scanner.

Using a Code Reader

A code reader is a small, handheld device that can be plugged into the diagnostic port on your car. Once connected, the code reader will scan the car’s computer for trouble codes. These codes will provide you with more information about the cause of the check engine light.

To use a code reader, follow these steps:

1. Locate the diagnostic port on your car. This port is usually located under the dashboard, near the steering wheel.
2. Plug the code reader into the diagnostic port.
3. Turn on the ignition, but do not start the car.
4. The code reader will scan the car’s computer for trouble codes.
5. Once the scan is complete, the code reader will display the trouble codes on its screen.

Using a Diagnostic Scanner

A diagnostic scanner is a more advanced tool than a code reader. Diagnostic scanners can provide you with more detailed information about the cause of the check engine light, including:

• The specific fault codes that have been stored in the car’s computer
• The possible causes of the fault codes
• The recommended repairs for the fault codes

To use a diagnostic scanner, follow these steps:

1. Locate the diagnostic port on your car. This port is usually located under the dashboard, near the steering wheel.
2. Connect the diagnostic scanner to the diagnostic port.
3. Turn on the ignition, but do not start the car.
4. The diagnostic scanner will scan the car’s computer for trouble codes.
5. Once the scan is complete, the diagnostic scanner will display the trouble codes on its screen.

Interpreting the Test Results

Once you have run the tests on your car, you will need to interpret the results. The trouble codes that are displayed on the code reader or diagnostic scanner will provide you with more information about the cause of the check engine light.

If you are not sure how to interpret the trouble codes, you can consult a mechanic. A mechanic will be able to help you diagnose the problem and recommend the necessary repairs.

Conclusion

If you see the check engine light come on, it’s important to have it checked out as soon as possible. By running tests on your car, you can help identify the cause of the check engine light and get your car back on the road.