Originally Posted by ClearwaterBMW
there is NO way that is true
the "CODE" is PERMANENTLY encoded to that key and can't be altered by any proximity issue(s)
otherwise..... keys would become "useless" all the time
since almost every car/bike manufacturer uses coded keys now....
you can bet they are VERY STABLE
From the 2005 GS owners manual: A spare key attached to the same ring as the ignition key used to start the engine could 'irritate' the electronics, in which case the enabling signal for the ignition, fuel supply and starter is not issued. Under these circumstances the motorcycle will refuse to start. Consequently always keep the spare key or keys separate from the ignition key.