⚠
warning HP
Error Code Toner Low
The toner cartridge is running low on toner and needs to be replaced soon.
✓ How to Fix It
Replace the toner cartridge with a new HP 85A Black Original LaserJet Toner Cartridge.
Source: page 1 of the official manual
From the manual
This error code appears in:
HP Laserjet Pro M1132 Multifunction Printer