Brief Bidirectional Control - Guesswork Be Gone Trouble starting the engine? Skip the guesswork, start by sending the command to the injectors to see what happens. With bidirectional control, the TopScan Pro swiftly locates and tackles vehicle issues head-on. From lights, door locks, windows. wipers, EVAP, and beyond, take complete command for total assurance. Specs Features Repair Information What's In The Box? Comparison FAQs