Ford takes the "honor" of having the most popular car password.
There are a good deal of folks out there that still use super-basic alphanumeric passwords to protect their online identities, whether it's for shopping, banking, or anything else you can do online these days. Recently, a company specializing in password management released a list of common passwords. Of the 25 that SplashData listed, only one is related to cars. If your password is Mustang, you should probably change it.