If your computer says the F166400 is offline:
: Remove all orange packing tape and protective materials from the exterior and inside the toner compartment. Load Paper printer canon f166400
Alternatively, maybe the user wrote "F166400" but there's a missing part. Let me check online quickly. Searching "Canon printer model F166400" doesn't bring up any official products. However, Canon's FX-8000 series includes toner cartridges with part numbers like F166400. That might be the case here. If your computer says the F166400 is offline:
Canon F166400 regulatory model number for the Canon imageCLASS LBP6030 printer canon f166400