CITROËN C4 CACTUS Owner's Handbook Manual page 168

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.
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Freezing of the AdBlue
additive
The AdBlue ® additive freezes at
temperatures below around -11°C.
The SCR system includes a heater for
the AdBlue ® tank.
In exceptional circumstances (vehicle
kept for a long period at temperatures
that are constantly below -15°C), an
emissions control system fault alert may
be related to freezing of the AdBlue
your vehicle.
Park your vehicle in a warmer area for
a few hours until the additive becomes
liquid again.
The emissions alert does not go off
immediately, it will occur after several
mile of running.
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