Alfa Romeo 4C Owner's Handbook Manual page 39

Warning lights on panel
INJECTION / EOBD SYSTEM FAILURE
In normal conditions, when the ignition key is turned to
MAR the U warning light switches on, but it should
switch off as soon as the engine is started.
The operation of the U warning light may be checked by
traffic police using appropriate equipment.
Comply with the laws and regulations of the country
where you are driving.
If the U warning light stays on or switches on when
driving, it means that the injection system is not working
properly; in particular, if the warning light comes on
constantly, this indicates a malfunction in the
supply/ignition system that could cause excessive
exhaust emissions, a possible loss of performance, poor
driveability and high fuel consumption.
On some versions the display shows the dedicated
message.
The U warning light switches off if the malfunction
disappears, but is still stored by the system.
If the U warning light flashes, it means that the catalytic
converter may be damaged.
Meaning What to do
3)
Under these conditions, the vehicle can continue travelling
at moderate speed without demanding excessive effort
from the engine. Prolonged use of the car with the warning
light on constantly may cause damage.
Contact a dedicated Alfa Romeo Dealership as soon as
possible.
In this case release the accelerator pedal to lower the
engine speed until the warning light stops flashing.
Continue the journey at moderate speed, trying to avoid
driving conditions that may cause further flashing and
contact a dedicated Alfa Romeo Dealership as soon as
possible.
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