Hi there, I had the same issue.
The first time my passenger sat down and moved the seat it triggered the sensor. I fiddled around with the cables underneath and got lucky enough that is stopped. But only for 2 weeks then popped again.
Then went to the dealership for service and they "Fixed" the problem.
Well they fixed it for a few months anyway.
My wife sat down in the passenger seat last night and the airbag sensor went again. This is getting to be frustrating! Should I pull a fuse and reset or keep scheduling my car for warranty service every month or two?
Cheers from Portland!