2017 Subaru Forester seats problems

Driver's subaru was struck from behind by a box truck while stationary on a highway (driver had stopped just short of a multi-car collision but the box truck behind her was unable to stop); box truck pushed the subaru into the car in front. Driver's seatbelt was on, but driver's chest struck the steering wheel and her head possibly hit the side window. Airbags did not deploy and seatbelt did not stop driver from striking steering wheel.

While operating my subaru forester an icon appeared on the dash indicating there was an issue with the airbags, at the same time the warning light indicating that the passenger airbag was off even though my wife was seated in the passenger seat. I contacted the dealership and had the car examined and was told that the passenger occupancy sensor was failing and needed to be replaced.