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Glow Plug Light
The light that comes on is the glow plug light (see photo below) and it has a number of functions:
(a) It should come on when you start the car. Turn the key to start the car and you'll notice that this light comes on and then goes off after a few seconds. It's telling you that glow plugs have been activated.
(b) If the light comes on while you are driving, it indicates that the
(the car's computer) has detected a problem, the signal having been provided by one (or several) of the many sensors to be found on the dCi engines.
If you search the forums for 'glow plug light' you'll find lots of posts which should give you an idea of what to look for.
Hope this helps,
Currently in levski's garage:
2001 Renault Megane 1.9dCi