I've never heard of an air bag having an expiration date.By the way, I'm curious. My car has passenger side airbag and those were original airbags since we bought it in 1993. I heard that airbags would "expire" (no longer working) after couple of years later. Are these airbags still working (and how do I know or test it)? If NOT, is it easy to take it out and replace for a new one? Where could I buy new air bags (parts) for driver side and passenger side? Thanks!