CITROEN DS3 Handbook page 196

Remaining range between 0 and 350 miles (0 and 600 km)
When switching on the ignition, the SERVICE
warning lamp comes on and the UREA warning
lamp flashes, accompanied by an audible
signal and the display of a message (e.g. "Top
up emissions additive: Starting prevented in
350 miles") indicating the remaining range
expressed in miles or kilometres.
When driving, the message is displayed every
30 seconds until the additive tank has been
topped-up.
Go to a CITROËN dealer or a qualified
workshop to have the AdBlue
®
You can also top-up the tank yourself.
Refer to the "Topping-up" section.
Otherwise you will not be able to restart your
engine.
Breakdown related to a lack of AdBlue
When switching on the ignition, the SERVICE
warning lamp comes on and the UREA warning
lamp flashes, accompanied by an audible
signal and the display of the message "Top up
emissions additive: Starting prevented".
The AdBlue
by regulations prevents engine starting.
tank topped-up.
® additive
tank is empty: the system required
®
To be able to start the engine,
we recommend that you call on
a CITROËN dealer or a qualified
workshop for the top-up required. If
you carry out the top-up yourself, it is
essential to add at least 3.8 litres of
AdBlue to the tank.
®
Refer to the "Topping-up" section.