air bag light code 21

[chupie]

First off I would like to thank every one who provides answers to the treads
people post here, neat site, you guy's have save me and others a lot of money..

now my next problem, 2001 ford windstar, air bag flashing code 21
any clue what this code means or what to look for?

any help would be apprciated

[email protected]

thanks