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:
Speedometer
The speedometer A-fig. 31 - 32 shows the vehicle speed.
...
New engines improve efficiency
To demonstrate its technical excellence, at the heart of the 2012 Punto is a
revamped range of five petrol and two diesel engines. Each offers a varying
degree of driveability and class-leading ef ...
Vehicle Modifications/Alterations
WARNING!
Any modifications or alterations to this vehicle could seriously affect its
roadworthiness and safety and may lead to an accident resulting in serious injury
or death. ...