If you got a used Ford buy cannot drive over 55mph, without fastening your seatbelt or other driving restrictions, you may be using a Ford MyKey, instead of the original Master Key.
What is Ford MyKey
Ford MyKey® technology helps parents encourage teenagers to drive responsibly. Program your key to a restricted driving mode setting that promotes good habits, such as increasing seat belt use, limiting vehicle top speeds and decreasing audio volume. (Source: Ford)
How to Reset Ford MyKey
In order to reset Ford MyKey you will have to have 2 working keys. With the keys, refer to your owner’s manual or follow on-screen menu instructions.
Can you Reset Ford MyKey with only one key
Having a 2nd key is the manufacturer mandatory requirement. If you only have one key for your Ford, contact a local auto locksmith in your area to get another copy of your car key made.