BlueDriver OBDII Scan Tool
With a screen in every car, there's an argument to be made that the OBDII port should go away. Until it does, you'll need a tool to decipher your car's mysterious warning lights. The BlueDriver is a solid choice. It connects to a companion app via Bluetooth, reading and clearing trouble codes, and supplying vehicle-specific Repair Reports so you'll know what parts to buy or what to tell your mechanic.