Sometimes the powdered toner is compacted from storage. Have you removed and agitated the cartridge?
Try the following
Is it asking to replace it, or to replace it soon?
What Fault code goes with the message (093-973, 093-922, 093-426, 093-973, 093-926) ?
Is it still working and just displaying the message?
I have xerox workcentre 6505, I change the black cartridge and it keeps telling me to change it.
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