CITROEN DS3 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 5 seconds after the ignition is switched on,
the screen indicates:
5 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 5 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 5 seconds after the ignition is switched on,
the screen indicates:
5 seconds after the ignition is switched on,
the distance recorder resumes its normal
operation. The spanner remains on.
Monitoring
For blueHDi Diesel versions, this alert
may also be accompanied by the fixed
illumination of the service warning lamp
when the ignition is on.
The distance remaining may be
weighted by the time factor, depending
on the driving conditions.
Therefore, the spanner may also come
on if you have exceeded the period
since the last service, indicated in the
maintenance and warranty guide.
For blueHDi Diesel versions, the
spanner may also be brought on earlier
than expected, depending on the
degree of deterioration of the engine oil
(depending on the country of sale).
The rate of deterioration of the engine
oil depends on the driving conditions in
which the vehicle is used.
37