What does the 'Toner Low' error mean on my Brother printer, and how can I clear it if I've just replaced the toner?

The 'Toner Low' error can sometimes persist even after replacing the toner due to the printer not recognizing the new cartridge. Ensure the toner cartridge is properly seated and clicked into place. Reset the toner counter through the printer's menu. The exact steps vary by model, but generally involve navigating to 'Menu' > 'Toner' > 'Reset Toner'. Refer to your printer's manual for specific instructions. If it still doesn't clear, the cartridge might be incompatible or faulty.