My sensor warning (ding, ding ding noise) has been going off for months now. Definitely related to passenger seat. I read other threads about connectors possibly coming loose as you move the seat fore and aft. I inspected the connections and they appeared to be fine. Recently my mechanic disconnected & reconnected them (no charge). The car was fine for 1 trip; after that, it was back to it's old ways. EXTREMELY annoying. This is the first post I've seen regarding $800 for a sensor. That hurts. Not sure what I'll do now.
2014 Volt, 70K miles.
2014 Volt, 70K miles.