airbag question

[feelstranger]

When I purchased my 200 the only thing "wrong" with it was that the airbag light was is on (with a little black tape over it).  PO told me he had attempted to have it fixed but that the part needed was the contact behind the steering wheel and it was too much $$ ($300?).  Not to mention that it was a dealer only repair or 'reset' or something like that.   Anyone know what might be up?  I wonder if I can take the thing apart and fix it or is that unlikely?
  So, I also found myself wondering if the Airbags in our 91's are in need of, or ever will need service anyway.  Are most people's still ok?  How do you know?  I know some manufacturers recommend service at some standard time  - like 10 years.
Thanks!