One problem related to air bag not deploy has been reported for the 2009 Mini Cooper S. The most recently reported issues are listed below.
I own a 2009 Mini cooper and the airbag and seatbelt warning lights come on whenever I get in the car. The light came on recently when I started the car and it now occurs every time I turn the motor on. I've been online researching the problem and discovered that this may mean that the airbags will not deploy if I have an accident. This appears to be a problem facing a number of Mini cooper owners and BMW has not resolved this problem after many complaints.