You will need to register your Canon gear HERE to access additional support options. If the printer is out of warranty, you would qualify for the Canon Upgrade program. This is for out of warranty units which have been diagnosed to require service or are incompatible with a new...
If the B204 error returns, please try 2 new ink cartridges. If the issue persists, your PIXMA MX492 would require service. You are eligible for Canon's Upgrade Program. This is for out of warranty units which have been diagnosed to require service, or for some reason are incompatible with...