I don't know about you, but I've been using OBD2 apps for many years, especially because I could get them up and running with a super-cheap ELM327 adapter. My favorite app has long been Torque, as the ...

The BlueDriver Pro, a favorite Bluetooth OBD-II scanner of ours, is down to just $70—it's all-time low price. It offers pro-level diagnostics, live data, and a great app.

That little yellow check-engine light is sneaky. Most of the time, you forget it could be there. But when it detects an issue, it illuminates menacingly. For many, the initial reaction might be to ...