Resetting a check engine light can often be done by using an OBD-II scanner, which identifies and clears diagnostic trouble codes. Alternatively, disconnecting the car's battery for about 15 minutes might reset the light, but it's good to know why the light is on first. Have you recently made any changes or repairs to your vehicle that might have triggered the light? It's always best to address the underlying issue first. How do you usually handle car maintenance?