door ajar and air bag light on 94 aerostar
 

3.0, 94, auto, 186K. rwd

How do I get the door ajar light to go off, it is driving me nutty?
Also, the air bag yellow warning light will occassional go on, then never
appear for weeks, then suddenly flash for a day or two? Should I be concerned about this issue or get it tested/repaired?

Thanks to all :)