One problem related to air bag not deploy has been reported for the 2012 Mercedes Benz C250. The most recently reported issues are listed below.
Takata recall I was involved in a head on collision in 2015 driving my 2012 mercedes C250. The impact was severe and totaled my car, but the airbags did not deploy. My crashing speed was well over 45mph. I purchased a Mercedes Benz from the dealer for its safety and I am disappointed that Mercedes Benz failed to recognize the defect before selling me a car that wasn't safe. I am lucky to walk away with minor injuries, I have been terrified of driving a motor vehicle ever since.