What does it mean if your check engine light is on?

When the check engine light illuminates on your dashboard, it serves as a warning that there may be a problem with your vehicle's engine or emissions system that requires attention. This light can signal various issues, ranging from minor problems like a loose gas cap to more significant concerns such as engine malfunctions or faults in the emissions system. The vehicle’s onboard diagnostics system detects these issues and triggers the check engine light to alert the driver to take action.

Addressing the problems signaled by the check engine light promptly is important. Ignoring it can lead to more severe complications, reduced fuel efficiency, or even failure to pass emissions tests, depending on the nature of the issue. Thus, the presence of the light indicates that a professional diagnosis is often necessary to pinpoint and resolve the underlying problem effectively. Being proactive about any warning lights can help ensure the longevity and safe operation of your vehicle.