Your car knows secrets about you. Here's how to protect yourself

Cars increasingly resemble a smartphone on wheels, storing personal information such as our location, how we drive, who we talk to and how to reach them. Some even hold a way to join our home WiFi network. If you’ve ever sold an old smartphone or laptop, you probably thought to wipe the hard drive first, to protect your privacy. When we sell a car, or return a rental car, a similar thought may not cross our minds, but cybersecurity experts say it should.