Universal Can-Bus Car Diagnostic Code Reader Scanner For Toyota The U381 Code Scanner is for real-time automotive diagnosis based on the OBD 2 protocol. It offers Full Feature Scanning including 'LIVE DATA". By simply plugging it into your vehicles diagnostic socket, you will be able to Read all Trouble Codes & Definitions related to the "Check Engine Light", Save & Review results, Reset the trouble light, Monitor & Freeze-Frame Data, +more.