I have the dashboard glowplug light permanently on, even whilst driving in my 51 Clio 1.5 DCi 65. It has been to the garage and had the glowplugs and the glowplug relay changed but every time it goes to the garage, the light goes out for a couple of days but then always comes back on again within a week. Does anybody have any ideas of what else it could be? I can't afford £50 to send it in every time to have it in exactly the same state a couple of days later. Any help much appreciated.