CITROEN DS3 Handbook page 199

In the event of a fault with the the ScR emissions control system
A system that prevents engine
starting is activated automatically
from 650 miles (1 100 km) after
confirmation of a fault with the SCR
emissions control system. Have the
system checked by a CITROËN dealer
or a qualified workshop as soon as
possible.
In the event of the detection of a fault
When switching on the ignition, the UREA,
SERVICE and diagnostic warning lamps comes
on, accompanied by an audible signal and the
display of a message "Emissions fault" to signal
a fault with the emissions control system.
If it is a temporary fault, the alert
disappears once the exhaust gas
emissions return to normal.
Practical information
during an authorised driving phase (between
650 miles and 0 miles) (1 100 km and 0 km)
If a fault with the SCR system is confirmed
(after 30 miles (50 km) covered with the
permanent display of the message signalling
a fault), when switching on the ignition, the
SERVICE and engine diagnostic warning lamps
come on and the UREA warning lamp flashes,
accompanied by an audible signal and the
display of a message (e.g.: "Emissions fault:
Starting prevented in 150 miles") indicating the
remaining range express in miles or kilometres.
While driving, the message is displayed every
30 seconds while the fault with the SCR system
persists.
You should go to a CITROËN dealer or a
qualified workshop as soon as possible.
otherwise, you will not be able to restart your
engine.
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