Quote:
Originally Posted by yes_its_neil
You can try this re-synchronizing procedure, remember to do it for your working key as well at the same time, otherwise it will not work afterwards. In other words, do both keys with the same process, follow the second key straight after the first. I have done it in the past for my X5 when I bought a replacement key.
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This does not have anything to do with being able to start the engine. That is only for the keyless entry system and again has nothing to do with the starting of the engine.
The key is bad and needs to be repaired or you need to buy a new one from BMW. I've seen and repaired many of these diamond keys with starting problems.