[GenesisFan]

https://play.google.com/store/apps/details?id=org.prowl.torque

This little dongle plugs into your car's OBD-II port, and talks to your Android phone (via an app like Torque) over Bluetooth to give you driving stats, check engine light codes, and more. There are a lot of similar devices out there, but this one has particularly good reviews. [BAFX Products BAFX3127 Bluetooth OBD2 Diagnostic Scan Tool, $19]

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