One problem related to front air bag has been reported for the 2009 Hyundai Elantra. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2009 Hyundai Elantra based on all problems reported for the 2009 Elantra.
I was in a front end collision on 7/30/10. The car of the driver who hit me had her airbags deploy, while mine did not. The impact to my car was severe enough that the radiator support had to be replaced along with the bumper headlight and hood. I was going 20 - 25 mph and the other diver was doing approximately the same speed.