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Battery remplacement

(2005 BMW 745i)
in Roswell, NM on April 21, 2014
just remplaced battery on my 2005 BMW 745I,wich it was working fine before I changed it.
however the car now isn't working right at all and the screen is showing a symbol( ENGINE MALFUNCTION POWER DOWN!)
So I wander if it supposed to be reprogram some how or what is causing the issue...
PLEASE HELP!!
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