One problem related to air bag not deploy has been reported for the 2015 Smart Fortwo. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2015 Smart Fortwo based on all problems reported for the 2015 Fortwo.
I was driving on the highway a safe distance behind a Lincoln navigator when they for no reason slammed on the brakes and stopped. I ended up rear ending the navigator. The rear of the car went up into the air came down and spun around three times before coming to a stop. My wife was injured. She sustained a broken rib cuts and scrapes and chest pains. No airbags never deployed in the car at all.