Yes, however, turning off the check engine light also clears other important diagnostic information used by technicians to assist in diagnosing the vehicle. This information could also be used by many states that have emissions inspections. If the tool is used to turn off the vehicle’s Check Engine Light (CEL), the vehicle will have to be driven to get it ready for an emissions test. Turning off the CEL will not cause the issue that caused the light to come on to go away. The CEL should be cleared only by a qualified technician.