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GL1 Vehicle Diagnostic Tool for iPhone
The Check Engine light: the bane of many a car owner's existence, who've helplessly forked over hundreds of dollars only to find out that there was a $5 sensor that needed replaced. Well, enough of that. The GL1 Vehicle Diagnostic Tool for iPhone ($100) plugs simply and easily into your car's On Board Diagnostics (OBD-II) port, letting you run an app to find out what your car's actually up to. As a bonus, it will charge your iPhone, iPad, or iPod touch at the same time, although you might look a little dorky with your phone permanently attached to a cord emerging from your dash.