You probably know that your smartphone and laptop store a lot of your personal data, such as your photos, messages, passwords and browsing history. But did you know that your car does the same thing?

Your car can collect and share a lot of information about you, such as where you go, what you say and how you feel. According to Mozilla research, most cars sold in the U.S. today are “privacy nightmares on wheels” that collect huge amounts of personal information.

This data is gathered by sensors, microphones, cameras and the phones and devices you connect to your car, as well as by car apps, company websites, dealerships and vehicle telematics. And if you don’t wipe your car’s data before selling or trading it in, you could be putting your privacy and security at risk.