CITROËN DS 4 Handbook page 39

Less than 600 miles (1 000 km)
remain before the next service is due
Example: 560 miles (900 km) remain before
the next service is due.
For a few seconds after the ignition is switched
on, the screen indicates:
A few seconds after the ignition is switched
on, the distance recorder resumes its normal
operation. The spanner remains on to
indicate that a service must be carried out
soon.
Service overdue
For a few seconds after the ignition is switched on,
the spanner flashes to indicate that the service
must be carried out as soon as possible.
Example: the service is overdue by 180 miles
(300 km).
For a few seconds after the ignition is switched
on, the screen indicates:
A few seconds after the ignition is switched
on, the distance recorder resumes its normal
operation. The spanner remains on.
For BlueHDi Diesel versions, this alert is also
accompanied by the fixed illumination of the
Service warning lamp when the ignition is
switched on.
Monitoring
The spanner comes on if you have
exceeded the specified time interval
since the last service, as indicated in
the manufacturer's service schedule.
For BlueHDi Diesel versions,
the spanner may also come on before
the normal service point, according to
the level of deterioration of the engine
oil, which depends on the driving
conditions in which the vehicle is used.
37