Dr. Meter OBD2 Wi-Fi Code Scanner | $12 | Amazon | Promo code N3PVY69Q

You’ve heard of Automatic’s smart driving assistant, but if nearly $100 is too rich for your blood, this cheap OBD2 dongle connects to any iPhone or Android device over Wi-Fi, and can fulfill many of the same functions using various third party apps.

Update: If you were having trouble with promo code N3PVY69Q yesterday, it should be working now.

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The most obvious use case here is understanding and clearing check engine codes, but these things give you access to pretty much all of the sensor data in your vehicle, at a much more granular level than you’d get from all of the symbols in your instrument cluster.