We have a Citroen Synergie V plate.
The remote control fob for the central locking has stopped working, it works
fine by putting the key in the lock, we have tried changing the batteries in
the key, but this has made no difference.
I could buy a new key and get it coded, but it is possible that the receiver
in the car has failed, how can I tell which unit has failed, without paying
for Citroen for the priviledge of plugging there computer into the engine