i JUST picked up my model 3 from Fremont. Was testing it in the parking lot and noticed that while backing up, the parking sensors picked up distance but there was no audible warning like with my model S. Is this normal or an error with my sensors? Tesla delivery rep says it’s an upcoming feature to be delivered via OTA update. I would have thought that the audible warning would be a standard feature. Anyone else have a similar experience with their M3??