you need to listen to wammers my friend , this is going to end in tears and wasteing money for you , no1 order new key from main dealer who will order it from huff , cost average £130.00 Does NOT need to be synced by anybody , it does it itself !!!!!! make sure you ask for key 4 , as you probably not aware of what keys issued previously ..take v5 and i.d, to order your key at main dealer ,,,,,,this is the only way you are going to sort this problem other than replacing a lot of expensive parts ,,, i.e . B.E.C.M.--- E.CU.--- DOOR LOCK ----KEYFOB ,,, IGNITION BARRELL ETC ETC , and so on ,,,,the choice is yours , I know what I would choose and did so when my fob was f*****d..... 2 days all sorted hope you resolve your situation ,,,,