What happens if I lose or break my Propeller sensors? Mandy July 31, 2017 21:47 Updated Follow Not to worry. Simply call or email us so we can get you what you need. Related articles I changed medications. How do I get a new sensor? What do I do with my old sensor? How do I know if my sensor stopped working? How to Remove Your Sensor for MDI How many sensors do I need? Why is my sensor beeping? How do I turn off Reminder Sounds? Comments 0 comments Please sign in to leave a comment.