crwdns2933423:0crwdne2933423:0
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crwdns2934249:0crwdne2934249:0:

Don't know about BMW key fobs, but my Toy fobs will start the car if I hold them next to the start button if the battery is dead.

Since this is an issue since you changed the battery, have you verified the LED lights when you push a button. If not the battery might be in backwards. It is also possible you got a bad battery. Happened to me once or twice.

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open