im looking to buy a 2002-2004 BMW 745i or Li. i wanted to know if there good reliable cars? are they known to have electrical problems? or are they known to have any types of problems?

Not a reliable car, especially the 2002-2003. I only own one, because I own a BMW specialty shop http://www.autolkn.com/bmwservice.htm, so repairs are not an issue with me. For the average consumer, I would avoid this car, unless you have money to burn.