How do I get the door ajar light to go off
All doors are shut but the door ajar light keeps coming on.
Ford explorer sport track
The 5th generation 2011 Explorer bore similarity to the Explorer America concept's construction, and includes a unibody structure based on the D4 platform.
Lonnie, the door Ajar switches are on the inside of the door (see attached diagram). To replace it you will have to remove the door panel, the water barrier etc. To determine which door has the problem, open each door with the key in the on position. The door that does not make a chime is the problem door. Remember that the drivers door makes a different sound. This video should help you with the door panel removal.
One of the sensors might be failing or broken. You'll have to open each sensor and check its connections to see if they are good. Then disconnect all of the sensors and test them one at a time and replace the one that isn't working.
EDIT: These images show what most of the door sensors look like on newer cars, they can either be on the car body where the door will press against it when closed or on the door where it will be pressed against the car body when the door is closed.