Oki CX2731 User Manual page 198

Please check %COLOR% Toner cartridge
Problem
Something is wrong with the toner sensor of the indicated color.
Solution
Check and reinstall the indicted toner cartridge. See page 206.
Please check %COLOR% Toner cartridge: %ERRCODE%
Problem
The toner cartridge lever of the indicated color is not locked properly.
Solution
Push the indicated lock lever to the right, then back to the left to
ensure that it is properly in the lock position. For example
198
Troubleshooting
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CX2731 MFP Basic User's Guide