Every now and then you will get this dreaded message on your Medtronic MiniMed 670G:

Do not Calibrate. Sensor Updating. Do not Calibrate. Sensor Updating. This could take up to 3 hours

In most cases the sensor updating message comes on because I have entered consecutive meter BG readings that the sensor does not like.

You know that chances this will mean that you have to replace your all-valuable sensor when it is all said and done. I have not had so much luck with the “updating” part. Almost always the story ends with “replace sensor.”

As a matter of fact if I get this error towards the end of life of the sensor, I will just change the sensor than wait for 3 hours.

What i do when i get the “sensor updating” message

To salvage a sensor that is only a couple days old (around 4 days or less), I disconnect and then reconnect the sensor following the procedure below:

  1. Very carefully remove the tape and completely disconnect the transmitter just like you during sensor change-out.
  2. Charge the transmitter once again.
  3. Remove the transmitter from the charger.
  4. Reinsert the sensor and start a new connection and go through warmup under
    Options>Utilities>Sensor Settings>Sensor Connection>Start New Sensor.