CITROËN DS 5 Handbook page 256

Range indicators
Once the AdBlue tank is on reserve or after
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detection of a fault with the SCR emissions
control system, when the ignition is switched
on, an indicator displays an estimate of the
distance that can be covered, the range, before
engine starting is prevented.
In the event of simultaneous system fault and
low AdBlue level, the shortest range figure is
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the one displayed.
In the event of the risk of non-starting related to a lack of AdBlue
The engine start prevention system
required by regulations is activated
automatically once the AdBlue
is empty.
Range greater than 1 500 miles (2 400 km)
When the ignition is switched on, no
information on range is displayed automatically
tank
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in the instrument panel.
Pressing this button displays the driving range
temporarily.
Above 3 000 miles (5 000 km), the value is not
specified.
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