Tile Mate (Key Finder)
Trying to find your lost keys when you're in a hurry is the worst thing ever. And while this isn't your traditional "car accessory" like most in our list, it's something everyone can appreciate.
Tile makes these small little Bluetooth enabled devices you can use to find and track your keys, luggage, or anything else. There's a convenient companion app, and the battery lasts for years, not days.
Strap a Tile Mate to your keys, and find them with ease by using the app whenever you lose your keys, again. I have 10 of these, and they're a life-saver.