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 stop light excluded), rear fog lights, direction indicators.
The failure referring to these lights could be: one or more blown bulbs, a blown protection fuse or a cutoff electric connection.
Symbols 
(where provided) coming
on on the multifunction display indicate a left/right-hand 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 stop light excluded), rear fog lights, direction indicators.
The failure referring to these lights could be: one or more blown bulbs, a blown protection fuse or a cutoff electric connection.
Symbols 
(where provided) coming
on on the multifunction display indicate a left/right-hand light failure.
See also:
If an interior light burns out
Modifications or repairs to the electrical system carried out incorrectly
and without bearing the features of the system in mind can cause malfunctions with
the risk of fire.
See “If a bulb burn ...
Water in diesel fuel filter
(Multijet versions - amber)
Turning the ignition key to MAR the warning light turns on, but it should go
off after few seconds. The warning light
turns on when there is water in the
diesel fue ...
Failure warnings
In the event of failure, the ESP system is automatically disconnected and the
instrument panel warning light á will come on with fixed light together with the
message on the reconfigurable ...