Diesel engine management lamp Warning lights and what they mean

Red warning lights mean you should stop the car as soon as it's safe.
Yellow warning lights mean that action is required.
Green warning lights are for information only.

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Engine management warning light on (diesel engines only).

Did this indicator lamp appear when the ignition was switched on, or did it appear while the engine was running?

With ignition on only. While the engine was running.

It is normal for this lamp to appear for a few seconds when the ignition is switched on to signify that the glow plugs are preheating.

There is a fault in the engine management system if the lamp appears constantly or flashes while the engine is running.

Drive slowly and carefully to an authorised repairer without delay and have the engine checked.