Whats a "Check Engine Light"

On vehicles with onboard computer controlled engine systems the computer is capable of monitoring various electronic and mechanical components for proper operation. When a fault is detected it sets the check engine light to warn the operator of the fault. Referred to as the MIL (Malfunction Indicator Light) in the business. The light has two modes constant on and flashing. If the light is flashing it means your vehicle has a serious problem and damage may be occurring. If you notice this light is flashing the operator should as soon as safe move the vehicle off the road and shut the engine off and have a certified mechanic look into the problem.