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It is quite possible that the TMPS lost connection when the wheel and bike were seperated. That's not the dealers fault. As Virkdoc suggest erase and rewrite is what you can do at home, if you have the tools to do it with.

Also by reading your tagline it looks like you are referencing a 2018 R1200GS? If so are the TPMS original or have they been replaced. If original they are at the end of thier lifespan.
 
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Can the TPMS be replaced without removing the tire? IOW, can just breaking the bead give you enough access? Also, I've read through various threads on DYI TPMS replacement and have to admit, I'm still confused on the exact steps. I do have a GS-911.
The TPMS can be replace w/o removing the tire. You will have to break the bead on one side of the tire then pus the sidewall in past the TPMS to be able to remove/reinstall it. The rear tire is a bit easiers as it is wider and you have more room to work whereas the front tire being narrower it tight working conditions. totally remvoe the tire ot

I have one it both ways I find it easier to either totally remove the tire, replace the TPMS then reinstall the tire or break both tire beads, remove one tire bead (like you were going to repalce an inner tube) so the tire can be pushed to the side to give access to the sensor.
 
It would be extremely difficult to replace it by simply breaking the bead as the tire will still be in the way. The best way would be removing the tire. If you replace just one you can go for a ride and it will wake up and connect on it's own. If you have the GS-911 you can replace them both but you need to make sure you write down the numbers on the units and note which one is in which tire. Use the GS911 to input the numbers so the bike knows which one is in which wheel then go for a ride. They will wake up and connect on there own.
Not really difficult. As long as the tire is pushed past the TMPS exposing it then its as easy as if the tire were removed.
 
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Is this true if you replace both at the same time?
Yes, you wirte the sensor to the position. That is why I like the wake up tool. Befroe I even take the wheels off the bike I remove the old sensors and then with the new sensor in hand I wake it up and then see if the software recognizes it and write it to the bike. If so the sensor is good to install in the wheel position you assigned it. If it does not write to the bike try again. If after several attempts it does not write to the bike its likely the sensor has a dead battery and/or is faulty.

In the past I went right to replacing the sensor putting the tire back on then installed bak on th ebike only to fid the sensor would not write to the bike. Then its a redo removeing the wheels, tires and sensor. The $9 wake up tool pays for itself in knowing a sensor you are wuing is operable befreo you install it.

Hex/Camheads have spaced for two sets of wheels so you can actually do all four (4) sensors at the same time. Watercooled bikes will only recognize one (1) set of wheel so you can only write a max of two (2) sensors.

Set "A" Front
Set "A" Rear
Set "B" Front
Set "B" Rear
 
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You say "Befroe I even take the wheels off the bike I remove the old sensors ". I am assuming by "remove " you mean from the bike's system? Because physically impossible to remove the sensors without taking the wheels/tires off. If so how do you delete the old sensors from the bike's system (I have a 2015GSW, if that makes a difference and a GS-911). TIA
Yes, electronically erase them from the bikes ECU.

Here is a turtorial on how to add. In here it will shoe how to erase a sensor and/or overwrite a new one in its place.

 
How about this…has anyone had their readings reverse? More than a year ago, my front read as the rear and vice versa. I can’t figure how to change that with my GS911.
Write down the TPMS identifier numbers, then erase/clear the numbers with GS-911 and then type in the sensor identifier in the right location hit the save/learn button and you're done.
 
Go with quality over price. Woody's is the best and safest route for a quality part at a significantly reduced BMW price.
IDK, the $18 per set 433hz banana style TPMS sensors I get off the big auction site or the jungle seem to work a treat. The write to the bike and display pressure and/or temperature.
 
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