What does trouble code C-2204 mean on our Minolta C451

This is a waste toner box error the waste toner box could be defective or the full sensor is defective i would start with replacing the waste toner box and clean the sensors on the door with some canned air the waste box and the sensors are located inside the lower front door the instructions on how to remove the waste box are on a label on the inside of the door

C2204. spent 6 hrs fixing this code. There is 3 sensors behind the toner collector box. one is for toner full system. The other detects the toner box. The one on the left under a black cover detects revolutions of the auger in the toner box. That sensor is defective.

Still showing error code c2204 after cleaning up waste toner box and checking of sensors behind it