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When the check engine light comes on, it can be a cause for concern for any driver. Ignoring the warning light can lead to serious engine damage and costly repairs. Therefore, it is essential to know the first thing to check when the check engine light comes on.

The first step is to use an OBD-II scanner to read the diagnostic trouble codes (DTCs) stored in the vehicle’s computer. The scanner will provide a specific code that corresponds to the issue causing the check engine light to come on. These codes can range from minor issues, such as a loose gas cap, to more severe problems, such as a faulty oxygen sensor or catalytic converter.

Once you have the DTCs, you can use online resources or consult with a mechanic to determine the cause of the issue. It is essential to address the problem as soon as possible to prevent further damage to the engine and avoid costly repairs.

If the issue is minor, such as a loose gas cap, you can fix it yourself. However, if the problem is more severe, it is best to take the vehicle to a qualified mechanic for repairs. They will have the necessary tools and expertise to diagnose and fix the issue correctly.

In conclusion, the first thing to check when the check engine light comes on is the diagnostic trouble codes using an OBD-II scanner. It is crucial to address the issue promptly to prevent further damage to the engine and avoid costly repairs. Remember, prevention is always better than cure.

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