What happens if I lose or break my Propeller sensors? Mandy November 12, 2018 15:09 Updated Follow Not to worry. Simply call or email us so we can get you what you need. Related articles I have changed medications. How do I get a new sensor? What do I do with my old sensor? How do I know if my sensor has stopped working? How many sensors do I need? Why is my sensor beeping? How do I turn off Reminder Sounds? How to Remove Your Sensor for MDI Comments 0 comments Please sign in to leave a comment.