CITROËN DS 4 Handbook page 302

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.
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.
Freezing of the AdBlue ® additive
The AdBlue ® additive freezes at
temperatures below around -11°C.
The SCR system includes a heater
tank, allowing you to
for the AdBlue ®
continue driving in very cold conditions.