What should be done if the check engine light comes on?

When the check engine light comes on, utilizing an OBD-II scanner to retrieve trouble codes and diagnose the issue is the most informed approach. The check engine light is an indicator that the vehicle’s onboard diagnostics system has detected a problem with the engine or related components. The OBD-II scanner connects to the vehicle's diagnostic port and retrieves specific trouble codes that provide insights into what might be malfunctioning, allowing for a more targeted approach to troubleshooting and repair.

Addressing the issue promptly is crucial, as it can prevent further damage to the vehicle. Ignoring the check engine light or delaying action can lead to potentially more serious problems down the line. While changing the oil is essential for maintaining engine health, it does not address the specific issues that would trigger the check engine light. Checking tire pressure, while important for overall vehicle safety, is unrelated to the engine performance and would not resolve the concerns indicated by the warning light. Therefore, using the appropriate diagnostic tool is the best first step to take when encountering this situation.