How much will it cost to shut the Airbag light off in my 2002 Ford Explorer?

You will need to get the air bag sytem diagnosed first. Light cannot be turned off. Light comes on because there is a fault in one of the compotents or wiring.

Horn when pushed, not remote, and cruise control working? If not post and can advise further! Also, with a flashlight, look 'closely' under drivers seat for any broken wires, green in color. Let us know!

The light can not just be "turned off.” This is a safety feature and the light is on because in the event of a collision the air bag/s will not deploy. The Safety Restraint System (SRS) will need to be diagnosed to determine the source of the problems and the correct repair. The diagnosis runs $ 59.95