One problem related to front air bag has been reported for the 2008 Toyota Matrix. The most recently reported issues are listed below.
On may 16th I was rear-ended while stopped at a red light. My 2008 Matrix xr was pushed into the back of a school bus. The force of the impact crumpled the front end of my car, yet the airbag didn't deploy. Should it have? I can send you photos of the accident and the damage to my car.