A door ajar sensor is a security function that alerts you when a door shouldn’t be absolutely closed. On a 2011 F150, you normally see a lightweight on the dashboard or hear a chime. The sensor is positioned within the door jamb and makes use of a magnet to detect when the door is closed. If the sensor shouldn’t be working correctly, you is probably not alerted when a door is open, which may result in a security hazard or injury to your truck.
There are a number of the reason why the door ajar sensor is probably not working correctly. One chance is that the magnet within the door jamb shouldn’t be aligned correctly. One other chance is that the sensor itself is defective. You may attempt to repair the sensor your self by following these steps: