The Check Engine Light (CEL) is a warning indicator—it means your vehicle's computer has determined that a component or system in your emission control system is not working properly. When the light comes on, one or more diagnostic trouble codes (DTC) are stored in the Engine Control Module. These DTCs remain even if the light goes out. To address a Check Engine Light problem, the DTCs are retrieved and the appropriate troubleshooting information is followed in order to determine the problem. Here at Walton's Auto Service we will make any repairs necessary.