Knowing the difference between OBD-I and OBD-II is vitally important, since neither are universal or interchangeable. However, there are some things you will need to know before making a purchase of an on-board diagnostics (OBD) tool. Most of these tools are relatively simple, plugging into the diagnostic port or connecting via Bluetooth so that you can easily access information on the internal operations of your car.
There is a variety of car diagnostic tools and software out there, but quality products need to be weeded out from those that would be a waste of money.
