Volvo XC90 Owner's Manual page 43

Instruments and controls
Indicator and warning symbols
QO
Messages on the display
Any warning or indicator symbol that appears
is accompanied by a message in the display.
Once you have read and understood the
message, press the READ button (A).
Messages which have been read are cleared
from the display and stored in the car's
memory. Fault messages will remain in the
memory until the fault has been remedied.
Very serious fault messages cannot be
erased from the display. They remain in the
display until the fault is remedied.
Messages stored in the memory can be read
again. Press the READ button (A) to see
stored messages. Scroll through the
messages stored in the memory by pressing
the READ button. Press the READ button to
return read messages to the memory.
If a warning message interrupts when you are
in the trip computer menu or wish to use the
telephone, you must first acknowledge the
message by pressing the READ button (A).