Hi .
If you have a BMW factory code for your audio/radio equipment get it, if you don't have a code and have a coded radio/audio system it's not that easy !
*First rule is disconnect the NEG terminal first always.(it's the smaller of the two terminals (-) .
Some radio savers will allow you to connect a slave battery sourse to the car to mentain the 12v supply in order to save audio equip codes.
Most if not all suppliers of battery's will fit the replacement battery FOC , but you will need the code's in most cases ,,, (a slave 12v supply will not erase radio codes)
If you don't have coded factory fitted audio equip , Happy days. refer to (*)
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