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:
Steering column lock
Engaging
When the key is to STOP or PARK remove the key and turn the steering wheel until
it locks.
Disengaging
Rock the steering wheel slightly as you turn the ignition key to MAR.
WARNING
N ...
At the filling station
Make sure that the left-hand sliding side door is completely closed before
refueling. You could damage the door and the sliding lock system which comes into
play when the fuel flap is open.
Y ...
Installation of electric/electronic devices
Electric/electronic devices installed after buying the car or in aftermarket
shall bear the and marking:
Fiat Auto S.p.A. authorizes the installation of transceivers provided that installation
...