Why does my printer say the ink level is low after having the cartridge refilled?

Your printer is remembering that cartridge as the one it just emptied. Many cartridges have an electronic signature which your printer remembers. There is no way to clear or fix this, simply keep printing ignoring the low ink warning.

You probably havent enterd on your computer that you refilled you ink. Try opening your printer and clousing it. Your computer should ask you if you replaced your ink of not.

u put it in wrong

sometimes it does that i used to have the same problem when i had that printer it should work you know but it doesn't hurt to get your printer checked

This problem is because the cartridges are designed to be replaced when empty, rather than refilled. They have an on-board chip which would need to be reprogrammed to make it appear like new, with the printer software showing a full ink chamber. This reprogramming is easy for Epson printers, resetters being easily available. For other models it is not so easy. But it still works.

you have to tell the printer that you have replaced it so that it has registered it has new ink inside. The printer level will then be adjusted to full accordingly. Some printers like mine (Canon) recognize that when u change a cartridge, it asks you which one you have replaced and adjusts the ink level(s) accordingly

reset the printer setings to say it is full their is really no sensor on a cartriage the pc just guesses about how long it will last do a calibration of the printer and select the full ink selection and calibrate it

i have a lexmark printer too, and it always says the ink is low even when a new one is in. its really irritating, but mine does still print

make sure you have them plugged into their right slots. and that they are attached. do a test run first. if it doesnt work take them back. walgreens should give you a new set with no problems :)