CGM features and fixes · Dexcom ONE+

Dexcom ONE+ sensor failed early: getting a replacement

Dexcom replaces a ONE+ sensor that fails before its 10-day life, without limit, when Tech Support confirms a product failure. Other early removals may get a courtesy replacement case by case. (Dexcom; Dexcom user guide, p. 63)

What the maker says to do

1. Remove the sensor by peeling the patch from the edge.
2. Insert and pair a new sensor.
3. Find the sensor serial number.
4. Contact Dexcom Tech Support as soon as possible.

Dexcom ONE+ is not sold in the US. All facts here come from Dexcom's UK and Ireland pages, the UK App Store listing and the outside-US English user guide (mmol/L). Dexcom says Share and Follow may not be available in all regions.

More on the Dexcom ONE+

• Follower app not updating
• Signal loss
• Sensor error
• Warm-up
• Compression lows
• Alarms not sounding
• Follower not getting alerts
• Compatible phones

Sensor failed early on other CGMs

• Dexcom G6
• Dexcom G7
• Dexcom Stelo
• FreeStyle Libre 2 and 2 Plus
• FreeStyle Libre 3 and 3 Plus
• Medtrum TouchCare Nano CGM
• Eversense 365
• Medtronic Simplera
• SIBIONICS GS1

Sources, quoted

• Dexcom: “In the event of a sensor failure prior to the completion of a sensor’s expected life, the user should contact Dexcom Tech Support as soon as possible.”
• Dexcom: “If the failure is determined to be related to the sensor not meeting the published performance expectations, a replacement sensor will be issued without any limits.”
• Dexcom: “To enable a quick, seamless experience, we encourage users to locate their sensor serial number prior to contacting Tech Support.”
• Dexcom user guide, p. 63: “Tip: Peel off patch from edge. 2. Insert and pair new sensor.”

Every quote is checked against its source page before each update of this site; last checked 2026-10-06. Makers change their apps; the source page is the authority when it differs.