Airbag sensor?

[Pennyfan]

Hi, My friend's TI got airbag light on, He brought his car to auto repair, they told him that the airbag sensor in passenger's seat is broken. They need to cut open the seat and replace sensor, which is very expensive. I am wondering if he can simply find a 2nd hand passenger seat to replace his own, does it fix the problem?

Also I am wondering how do people solve the airbag light problem when they are swapping oem seats with after market racing seats?

Thanks