Prior to 1998 you could use the MIL (Multifunction Indicator Light) codes on your dash. This tool accomplishes the same thing plus a lot more. In these days of computerized cars it's a necessity if you wish to fix your own vehicle. Don't expect this tool to tell you exactly what went bad and what part to replace. You need to have a working knowledge of automotive mechanics, and a service manual of the vehicle is a great help (almost a must). This tool will steer you in the right direction.
Example; My car's transmission quit dead in the road without any prior warning. Do I take it to a dealer and spend much $$$ $2400 or so for a rebuild? Not yet. My scanner said "Gears #1,2,3,4 had the wrong gear ratio." Huh wot?? Well, after examining my service manual,I determined that a sensor that measures input and output speeds must be bad. I bought the sensor for $16.50 and fixed it. By the way, I'm not an auto mechanic. I'm a diemaker.
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