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:
Front/Rear Side Marker Lamps
1. Remove portion of the wheel liner to allow hand access to side marker lamp.
2. Rotate the bulb socket counterclockwise, and remove the bulb and socket assembly
from the housing.
3. Pull the bul ...
External light failure
The warning light on the dial comes on (on certain versions together with the
message on the display) when a failure is detected to one of the following lights:
taillights, brake lights (3rd ...
Traction
When driving on wet or slushy roads, it is possible for a wedge of water to build
up between the tire and road surface. This is known as hydroplaning and may cause
partial or complete loss of vehi ...