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:
Parking
Switch off the engine, pull up the handbrake and engage a gear (1st gear or reverse,
according to whether the vehicle is facing up or downhill) and leave the wheels
turned. If the vehicle is left ...
Rubber hoses
As far as the brake system and fuel rubber hoses are concerned, carefully follow
the “Service schedule” in this section.
Indeed ozone, high temperatures and prolonged lack of fluid in the system ma ...
Front passenger air bag deactivated
Warning light comes on on the dial when front passenger air bag is deactivated.
With front passenger air bag on, turning the ignition key to MAR, warning light
comes on flashing on the cluster fo ...