Hyundai 2010 Elantra - Manual (Page 128)

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Features of your vehicle
LCD display warning (if equipped)
Door Open
This warning illuminates when a door is
not closed securely.
The indicator displays which door is
opened.
Low Fuel!
This warning indicates the fuel tank is
nearly empty. When it comes on, you
should add fuel as soon as possible.
Driving with the fuel level warning on or
with the fuel level below "E" can cause
the engine to misfire and damage the
catalytic converter (if equipped).