Kobra OBD2 Wi-Fi Scanner | $14 | Amazon
Graphic: Shep McAllister
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Your car’s computer spits out a ton of information about your battery health, your gas mileage, and any potential engine issues, and this cheap OBD2 dongle connects to any iPhone or Android device over Wi-Fi, and lets you make sense of all those 1s and 0s with an app. Just use promo code D2KC54JP at checkout to get it for $14, then plug it straight into the OBD2 port below your steering wheel to start speaking your car’s language.