Quote:
Originally Posted by wpoll
And remember that resynching just one key will block any/all other keys not sync'ed at the same time. 
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Yes, and OP, you can use a Foxwell or BMW Scanner (among other things) to see if each key is synchronized. As soon as you put it in the ignition it will tell you which key is in the ignition and whether it is synchronized or not. If you have one of these tools, try checking both keys. If both are still synchronized, then like wpoll said, you did not actually resynchonize the one key. Something else is going on.