CITROËN C4 Handbook page 192

Driving
Reactivation
Press the "ECO OFF" switch again.
The system is active again; this is confirmed
by the switch warning lamp going off and the
display of a message.
The system is reactivated automatically
at every new start using the key or the
"START/STOP" button.
190
Operating fault
In the event of a malfunction with the system,
the "ECO OFF" switch warning lamp flashes,
then comes on continuously.
have it checked by a CITROËN dealer or a
qualified workshop.
In the event of a fault in STOP mode,
the vehicle may stall. All of the
instrument panel warning lamps come
on.
Depending on version, an alert
message may also be displayed asking
you to put the gear lever into position N
and put your foot on the brake pedal.
It is then necessary to switch off the
ignition, then restart the engine using
the key or the "START/STOP" button.
Maintenance
Before doing any work under the
bonnet, deactivate the Stop & Start
system to avoid the risk of injury related
to an automatic change to START
mode.
This system requires the use of a 12 V battery
of specific technology and characteristics
(reference numbers available from a CITROËN
dealer or a qualified workshop).
Fitting a battery not listed by CITROËN would
introduces the risk of faults with the system.
The Stop & Start system makes use of
an advanced technology. All work on
this type of battery must only be carried
out by a CITROËN dealer or a qualified
workshop.