2001 Dodge Stratus AIR BAGS

Interior problem
2001 Dodge Stratus 4 cyl Two Wheel Drive Automatic 146.00 miles

Bought car off of a car lot. It was a used car but the dealer said it was hit in back end. And he said he fixed every thing back!Come to find out it was hit in the front end. It had blowed both air bags. Would like to know if they are supost to be replaced if they are sold off the lot. Thaqnk you very much.