How to Bypass OKI Printer C301 Low Toner Warning!
power printer off
hold UP and DOWN menu keys and power on.
click OK for maintenance menu,
type the password: 000000 (6 times zero)
go to Eng Diag Menu and select Toner Sensor
click OK – Enabled flashing
click up or down and select DISABLED
click and HOLD “OK” key until stops flashing
hit the return key several times until rebooting.
PRINT with “Low Toner” warning.