Turn the knurled ring to 
.
The warning light 
on the instrument
cluster will come on.
See also:
CO2 emission at exhaust
The CO2 emission levels at the exhaust given in the following table refer to
combined consumption.
...
General warnings
WARNING
If the warning light does not
turn on when turning the ignition key to MAR or if it stays on when travelling,
this could indicate a failure in safety retaining systems; under this condit ...
The eco:Drive system
An innovative software program developed with Microsoft, called eco:Drive, is
available to new Fiat Doblò drivers. The system uses the USB port to analyse the
driving style helping the driv ...