If your engine check light comes on, the Scangauge will also give you the fault code (which you can look up on line) and allows you to delete the code from your computer which turns off the engine check light. It beats having to take the vehicle to a mechanic and having him charge you $75 to do it. It's also nice to know that you may be having problems with an O2 sensor rather than some major problem with your engine. And if you zero it out, it may go away.
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