“Bi-directional” means it can both read data from your car and send commands back to it. In other words, it can talk to your car and make it perform specific actions. Think of it as having a two-way conversation with your car’s computer, rather than just listening to what it has to say.
Check out the best Bi-Directional scanners HERE (Amazon)

Hi, I am Juraj “Yuri” Lukacko. I got frustrated by unhelpful and scammy mechanics, so I decided to learn everything about car diagnostics myself. I test dozens of new car diagnostic tools every month along with learning new strategies to fix and customize cars. About Juraj Lukacko (Yuri)