If you run out of AdBlue, your diesel vehicle will not be able to start or continue driving for long. AdBlue is a fluid used in diesel engines to reduce harmful emissions - so, if the AdBlue tank runs dry, the system detects this and triggers a warning on your dashboard.
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Following this, if you attempt to start the engine when the AdBlue is empty, it might prevent the car from starting at all.
Technically, it’s safe to drive to a refueling station if you still have AdBlue left, but if you completely run out, the vehicle will eventually prevent you from driving to avoid damaging the engine.
It’s essential to top up the AdBlue as soon as possible to avoid these issues.