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Old 09-06-2012, 01:16 AM   #28
scottjoh
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Join Date: Aug 2008
Location: Torrance, CA
Posts: 1,977
My Ride: '99 323i & '02 540i
If it no longer works/syncs after you opened it and changed that battery it's pretty obvious you screwed it up. You have the right sync procedure and if the key is in working condition it will work since it worked before. No workie means the key is no longer good.
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