If your dashboard light is indicating "Check Engine" or "Service Engine Soon" or displays an engine symbol this is the "Diagnostic Trouble Code" (DTC) and is stored in the computer's memory. If this should happen or has happened bring your vehicle in for to be checked. The technician will retrieve the stored diagnostic trouble codes from the vehicle’s OBD II computer using a “scan tool.” The information obtained will assist the technician in isolating the particular systems having the problem. It is important to note that, while the OBD II system may identify specific systems and certain operating condition information, these are often only part of the job. It may still take diagnostic skill, knowledge and additional research to determine the actual cause of the problem. For example, the OBD II system may identify a problem with a sensor circuit, but the technician must still perform specific diagnostic steps on that system to determine whether the sensor itself is at fault, or a loose connection or even the vehicle’s computer is causing the problem or whether the component that the sensor monitors is defective. The only way to do that is to have the proper equipment, reference material and training