Have you ever looked under your car's steering wheel at all the wires, fuses, and plugs? If so, you might find an odd plug called an OBD-II port. That's the same port any technician uses during a smog test, and mechanics access it to scan for check engine light errors, but that's not all it can do. You can plug several useful or weird things into that 16-pin port.
How-To Geek
8 useful things you can plug into your car's OBD2 port
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