I changed the oil in my Toyota Corolla, but the oil warning light is still on. What could be the reason?

I had the same issue, and it turned out I needed to reset the oil change indicator from the dashboard screen. Try going into the settings and see if there’s an option to reset the oil warning light.

the oil pressure sensor might be faulty or need cleaning. Also, make sure you used the right type of oil and that the new filter is properly installed.