CITROËN C4 PICASSO Handbook page 46

Instruments
In the event of a fault with 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 AdBlue, SERVICE and diagnostic
warning lamps come 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.
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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 AdBlue
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
expressed 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 AdBlue 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.