Applies to: vehicles with diesel engine
If the indicator lamp 
lights up when the ignition is switched on, the glow plugs are preheating.
lights up when the ignition is switched on, the glow plugs are preheating.
If the indicator lamp does not light up or if it flashes while the vehicle is moving, there is a fault in the engine management system.
Drive slowly to a qualified workshop without delay and have the fault rectified.