The needle shows the fuel present in the tank. When the fuel reserve warning light A-fig. 35 - 36 comes on (on certain versions with the dedicated message on the reconfigurable multifunction display) it means that there are approximately 5-7 liters of fuel left in the tank.
E - tank empty.
F - tank full.
Never travel with the tank almost empty: lack of fuel could damage the catalyser.

IMPORTANT
The needle will point to E and the reserve warning light A will flash to indicate a fault in the system. Contact a Fiat Dealership to have the system checked.
See also:
Reactive Head Restraints — Front Seats
The front driver and passenger seats are equipped with Reactive Head Restraints.
In the event of a rear impact the Reactive Head Restraints will automatically extend
forward minimizing the gap bet ...
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
...
Operation
Each time the car is started turning the ignition key to MAR, the Fiat CODE system
control unit sends a recognition code to the engine control unit to deactivate the
inhibitor.
The code is sent o ...


