All OBD scanners are not created equal. And right now (Dec. 3 through Dec. 10), you can save 15% on the standout Carly ...

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And then I tried using a neat little device I'd been sent for testing called a Carly OBD scanner. Carly works in a similar way, plugging in to your car's OBD port (all cars post 1996 have one) and ...