Hi, did you ever get this problem sorted, because i had this problem on my first Picasso 02 1.8sx after 18 months front passenger door, and on my latest Picasso 54 1.6 Desirefront drivers door,after 13 months.It is the individual door solenoid that goes faulty for no reason and the door just does not open with the central locking keypress but either front doors will open with the key or from the inside door pull.The solution is back to the garage for door solenoid mechanisim replaced.