My battery on my 320 D 2002 e46 Toiuring may need replacing. I was advised that for this it is NOT necessary to do an electronic engine reset following cutting off the electrical power supply.(unlike on later models). However it may be necessary to reset the radio using the code. I don't have the original code but was able to Google the steps required to get it. But I am not sure how to input it if and when the system asks me to do so. Help would be appreciated!