Edlit615

I put an aftermarket y pipe on my gfs 91 NA vert and we put it back down on the ground and went to test drive it to find out it has no power. If were lucky we can just barely make it to 40mph ish. With this being said, the airbag light is flashing 4 times and the only info we can find is that it says s-sensor. We dont know how to solve both of these issues and really need help. It seems its in some kind of limp mode and i dont know if that is connected to the airbag light flashing. And help would he awesome!