I've got a cat1 sigma alarm on my 172 it was upgraded from a cat 2. I have no extra fob and no code with any of the documents I had with the car. The alarm isnt armed (cant set it off for love nor money, except when disconnecting the battery) just chirps when I don't close the door properly and use the renault fob to lock. I have a little touch pad inside the car where I can input the code.. its just.. I don't know it. Now its a waste if I cant use it I have no idea where to start really apart from phoning up sigma themselves I would imagine. The last alarm I bought was a toad ai606 and that was fitted by sextons in swansea (20mins from me) and was always told that if I lost a fob or had any problems they could sort me out. The problem I have is the local garage that fitted this alarm is in Kent!