The Check Engine Light appears on the dashboards of all late-model vehicles to signal that there is a possible mechanical or electrical problem that needs to be addressed. The compact and easy-to-use PocketScan Plus attaches to the automobile's OBD-II port, displaying the error code involved on its large, backlit display. Three severity levels tell you at a glance if it safe to continue driving or if immediate repair is needed. The PocketScan Plus also puts you in touch with the emissions status of vehicles and allows you to easily review and erase codes from the automobile.