does it not work from the plip key only or is it from the central locking button on dash too? If its just that the plip has stopped,put in a new battery in the key body,they come in half, then turn the ign to on only,so the dash lights are on only! press and hold the lock button on the plip for approx 15 secs, let go, turn ign fully off and remove key. DO NOT press any buttons on key etc and leave alone for approx 1 min, then try plip,this procedure is to re syncronise plip only,(this wont program a new key, for that you need your citroen dealer with a lexia diag tool,and your code card,but if you dont have it your dealer can get the security code) Hope this helps
spannerman
August 2010