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I had the same issue with my 2017 model s 75d. I disconnected all batteries, the main and the 12 volt. Left it disconnected for 30 minutes. When I reconnected everything the "low key fob battery" notification on screen was gone.
I just purchased a 2017 MS 75D, It came with 1 key fob. I am getting a message on instrument panel stating key fob low battery. I changed battery and reset everything. Still has message. How to remove this message please ???