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Yes the Sensors changed the way they transmit and receive. They are not backwards compatible.
Looking through the web when I was trying to figure out why the sensors did not work I found BMW changed the sensors in 9/2010. Looking at a few of the part numbers it seemed until 10/2011 one part number worked and then the part changed again. I am not sure exactly which date is the cutoff.
When i put my winter tires on the sensors would never connect and communicate with the vehicle. As soon as I put the new sensors in and programmed it the light went out and haven't had a problem since. I think I spent 200 on the sensors and 60 on the install at Pep Boys.
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