Hi All, just bought my daughter a 2003 plate 1.9 zetec tdi, only niggle is when remotely locked with key, the passenger door does not lock? the motor in the door makes the noise (as if it is) a couple of times but doesnt lock. I sat in car and held in lever in this door, then used key on remote to lock other doors and they all stayed locked. but cant do that all the time. If I lock this door from inside, then get out of car and use remote, then this door opens and the others all lock? anyone know what it could be please?