Most repair shops charge $40, $50 or more just to diagnose why your check engine light came on. Now you can find out for yourself and save! This OBD II scan tool reads and displays diagnostic trouble codes for most 1996 and newer vehicles. It connects to your vehicle in seconds and comes with a manual filled with the most current trouble codes so you'll know exactly what needs to be repaired. It also automatically turns off the checkengine light and erases the OBD system. 1-year limited warranty.