Hi all, I have a Citroën C5 2001 3L Exclusiv I haven't used it for a couple of weeks and when I tried the remote key didn't work. So unlocked it with metal key and alarm went off etc. Anyway, then I couldn't start the car, it was coming up with some security type warning in the box, then after a few tries it's gone into energy saving mode. So I took battery out and charged it up, put back in and followed bsi reset procedure but still only comes up with energy saving mode and engine turns over but won't start. I only have 1 key. Is there anything I can do? Thanks :) Stu