What happens if I lose or break my Propeller sensors? Mandy February 18, 2020 14:12 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? Mobile FAQ MDI Sensor Technique Why can’t I give my sensors to someone else?