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Did your vehicle's check-engine light just pop on? An OBD-II scanner can provide some direction. We tested a handful to find ...

The scanner you buy should depend on which cars you plan to use it on most often. Some code readers are designed to work best with certain brands or even certain cars.

You can purchase any global scan tool — often called a code reader — at most automotive parts stores or online.

Which brings up the question, just because you can buy a cheap code reader and scan your own car, should you? The answer is both yes and no.

We've all been there: you're driving along, minding your own business, when all of a sudden your check engine light comes on or you begin to hear a mysterious rattle that you can't quite identify. At ...