YOU CAN'T.If you don't have the code . You may find it cheaper to get new fob and reset for about £100 .I know because I've just had it done. Find on line for about the same money saved me alot of time happy motoring.
mondo
May 2007
has to go to rover as it is linked to ecu. you will find the unit under pass seat or on later models the drivers seat
howtomendit.com for free repair help, information and advice.
Try fixfault.com to fix cars.