BlueDriver plugs into a car's OBD-II port, reading diagnostic data from the engine and sending over Bluetooth to your phone.

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The QR code helps you find the associated BlueDriver app.

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The OBD-II port was mandated for cars from model year 1996 and later.

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The finger grip at the top of the BlueDriver OBD-II scanner makes it easy to pull out of a port.

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At $99.95, BlueDriver offers a lot of capabilities and help for the DIY auto mechanic.

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The BlueDriver app opens with a menu screen, using icons for its various functions.

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The Live data stream lets you see what's happening in your engine while it is running.

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BlueDriver even shows OBD-II Mode 6 diagnostics, which tend to be unique to different makes but can warn of potential engine problems.

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The Smog Check feature does not guarantee your car will pass a smog test, but will likely tell you if it won't, and possibly point you to why it will fail.

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BlueDriver stores any error codes thrown by the engine.

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BlueDriver shows how long, and for how many miles, a check-engine light has been on, if the OBD-II in that car supports it.

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Lemur Monitors offers five repair reports for free, then more at a rate of five for 99 cents, an excellent value considering each report shows potential causes for error codes along with fixes.

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