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:
Replacement Tires
The tires on your new vehicle provide a balance of many characteristics. They
should be inspected regularly for wear and correct cold tire inflation pressure.
The manufacturer strongly recommends ...
Symbols
Special colored labels have been attached near or actually on some of the components
of your Fiat Doblò. These labels bear symbols that remind you of the precautions
to be taken as regards ...
Spare Tire Removal
The spare tire is stowed to the underbody below the cargo area.
1. Remove the plug located in the rear cargo area.
Winch Access Plug
2. Fit the wrench tool over the drive nut. Use the wrench to ...