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:
25. Temperature Gauge
The temperature digital scale shows engine coolant temperature.
Any reading within the normal range indicates that the engine cooling system
is operating satisfactorily.
The gauge pointer will lik ...
Engine oil
1.28V versions
1.3 Multijet versions
Checking engine oil
Check the oil level a few minutes (about 5) after the engine has stopped, with
the car parked on level ground.
Check that the level i ...
Right-hand direction indicator
The warning light on the dial turns on when the direction indicator control lever
is moved upwards or, together with the left indicator, when the hazard warning light
button is pressed. ...