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      01-23-2013, 05:23 PM   #3
BMWinAZ
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Drives: 2007 BMW X3 3.0 si
Join Date: Jan 2013
Location: US & Germany

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I know for a fact that a new battery needs to run through the computer recognition for my 2007 x3. I had this done only a few weeks ago. If this step is omitted the computer will not recognize the battery as new and electrical fault codes may show up. This was confirmed by two mechanics I tend to trust. I can't imagine a 2005 model being very different in this aspect.