Thank you very much for your help. In defense of my mechanic, I don't think he actually looked at any codes. I explained what was happening, where the engine power reduced would kick on and I could only go 2 miles an hour. He said the throttle body sensor was bad. So I replaced the whole thing, and now that problem stops.

I'll take the full list of codes to him now, and tell him about the yaw sensor.

Edit: Yes, I do believe the airbags have deployed in the past. I bought this as a salvage title, and the airbag light has always been on.

 

Thus it is proven. QED for the nerds.

The rollover sensor is a 1 shot sensor, I don't know if it does anything with the yaw sensor. The "airbag brain" is a 1 shot thing.

Leaving seemingly unimportant facts out leads us down 4 pages of tail chasing. You need someone to fix the restraint system first. It is related.