Lexus UX 250h 2023 Owner's Manual, Quick Manual page 14

Running out of fuel
When the vehicle has run out of fuel and the hybrid system cannot be started, refuel the
vehicle with at least enough gasoline to make the low fuel level warning light go off. If there is
only a small amount of fuel, the hybrid system may not be able to start. (The standard amount
of fuel is about 1.8 gal. [7.0 L, 1.5 Imp.gal.], when the vehicle is on a level surface. This value
may vary when the vehicle is on a slope. Add extra fuel when the vehicle is inclined.)
Hybrid warning message
A message is automatically displayed when a malfunction occurs in the hybrid system or an
improper operation is attempted.
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If a warning message is shown on the multi-
information display, read the message and
follow the instructions.