What happens if I lose or break my Propeller sensors? Mandy January 19, 2019 01:05 Updated Follow Don’t worry. Simply call or email us so we can get you what you need. Related articles MDI Sensor Technique How do I know if my sensor stopped working? What is my group name? How to attach your Sensor for MDI with White Button I changed medications. How do I get a new sensor? What do I do with my old sensor? Comments 0 comments Please sign in to leave a comment.