Why does a Dexcom G7 say sensor not found after applying a new sensor?
Answer
Sensor not found usually means the G7 was not fully inserted, pairing started too early, or the phone cannot reach the sensor over Bluetooth. Confirm the applicator finished correctly, wait several minutes, then retry pairing in the official Dexcom app before replacing the sensor.
Before you start: stop right away if…
- Follow Dexcom’s medical device instructions for sensor placement and replacement; incorrect handling can affect readings.
Follow these steps
Confirm the sensor was fully applied
Check that the applicator clicked through the full insertion process and the sensor patch is flat against the skin with the transmitter portion attached as shown in the Dexcom G7 instructions.
You should see: The sensor looks fully seated and ready to pair.
Wait before retrying pairing
Stay near the sensor with Bluetooth on and give the G7 several minutes, often about 5 to 10, before scanning or pairing again in the Dexcom app.
You should see: The app finds the sensor, or the same sensor not found message returns after waiting.
Retry pairing in the Dexcom app
Open the official Dexcom app, follow the on-screen new sensor or pair steps, and keep the phone unlocked and close to the sensor until pairing finishes.
You should see: Pairing succeeds and warm-up or glucose readings begin, or a clearer error appears.
Use Dexcom help if it still cannot find the sensor
Open Help in the Dexcom app for sensor not found guidance. If the message continues after a correct insertion and wait, contact Dexcom technical support for replacement or next steps.
You should see: You have an official support path or replacement guidance for a sensor that will not pair.
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Extra tips
What to look for: The exact Sensor not found message, whether the sensor looks fully seated, Bluetooth on, and any other Dexcom error code on screen.
Before you change anything: Confirm the product is a Dexcom G7 sensor and the official Dexcom app is installed. Keep the phone within a few feet of the sensor during pairing. Do not remove a working sensor unless setup truly failed. Never share account passwords or codes with unexpected callers.