How do you change odometer display to kilometer from miles on my BMW e39 2002?

To change the odometer display from miles to kilometers on a 2002 BMW E39, you can typically do this by pressing and holding the trip reset button on the instrument cluster while turning the ignition key to the "on" position (without starting the engine). This should toggle the display between miles and kilometers. If this method does not work, you may need to consult the owner's manual or a BMW dealership for further assistance.