i cant think of why the check engine light is on

Hi this is Dusty, I'm one of the auto experts on RepairPal's Car Genius team! It could be as simple as the thermostat; it'll likely depend on the specific fault that is being stored and any symptoms that are present. The optimal engine temperature (coolant temperature) is crucial for efficient operation and can have an impact on fuel economy and emissions. If you're still unsure, have it evaluated by a competent professional. If you have any other questions or would like to help with finding a RepairPal Certified shop in your area, give us a call! 877-913-1554