Turning the key to MAR the warning light on the dial turns on, but it should go off as soon as the engine is started.
If the 
warning light turns on when
the car is travelling (on certain versions together with the message on the display),
stop the engine immediately and contact a Fiat Dealership.
See also:
Eobd - engine control system failure
In normal conditions, turning the ignition key to MAR, the warning light turns
on, but it should go off when the engine has started. The initial turning on indicates
that the warning light is ...
Low brake fluid level
HANDBRAKE ON (red)
Turning the ignition key to MAR the warning light turns on, but it should go
off after few seconds.
Low brake fluid level
The warning light turns on when the level of the bra ...
Reconfigurable multifunction display
The “Multifunction display” shows all the useful information necessary when driving,
more particularly: ...