Ever wonder what those weird black-and-white square codes are? Here's how to read them with an iPhone, a BlackBerry, or an Android smartphone.

It is prudent for a mechanic to erase codes, operate the vehicle, and then see what codes come back. If a code returns, underlying problem is likely a valid one.

We recently got our hands on the new GoTech mobile OBD-II diagnostic tool and put it through its paces on several trucks in our fleet. The GoTech is more than just a code reader, though.

With contactless interactions more common than ever, there is more of a need to read a QR code than ever. Here's how to read QR codes using your iPhone, iPad, or iPod touch.