CITROEN DS3 Handbook page 197

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
The UREA, SERVICE and diagnostic warning
lamps comes on, accompanied by an audible
signal and the display of the message
"Emissions fault".
The alert is triggered when driving when the
fault is detected for the first time, then when
switching on the ignition for subsequent
journeys, while the fault persists.
If it is a temporary fault, the alert
disappears during the next journey,
after self-diagnosis of the SCR system.
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), 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.
The alert is repeated when switching on the
ignition.
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.
Practical information
Starting prevented
Every time the ignition is switched on, the SERVICE
and engine diagnostic warning lamps come on and
the UREA warning lamp flashes, accompanied by
an audible signal and the display of the message
"Emissions fault: Starting prevented".
You have exceeded the authorised
driving limit: the starting prevention
system inhibits engine starting.
To be able to start the engine, you must call on
a CITROËN dealer or a qualified workshop.
195