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:
Fuel Filler Cap (Gas Cap)
The gas cap is located on the passenger side of the vehicle. If the gas cap is
lost or damaged, be sure the replacement cap is the correct one for this vehicle.
Fuel Filler Cap
CAUTION!
• Dam ...
“Distance unit” (Dist. Unit)
The display gives information according to the set unit (km or mi). To select
the required distance units, proceed as follows:
...
Fix & go (quick tyre repair kit)
On request the car can be fitted with a quick tyre repair kit, called “Fix &
Go”, replacing the common tool kit and the spare wheel.
The Fix & Go kit is located in the boot under the moquet ...