[frans saturnus]

Hi All,
I have a Compact on a 51 plate, the dashboard airbag light and also the rear light warning stay illuminated quite often, does anyone know any reasons why this happens sporadically rather than just staying on ?
The lights on the illuminated "car icon" (the one that shows if a door is open or a light is left on) , are they actually indicative of the actual light the fault is in ? e.g. n.s or o.s