Of course there are many more other factors that will affect the accuracy of autofocus, and one of them is the aperture.
The aperture refers to the opening of the lens and it controls when the light will stop entering your camera through the lens. It can have a huge impact on the auto-focus of your camera.
For example, when the light is low, the maximum aperture will affect the auto-focus accuracy. However, since normally focusing is done at maximum aperture so in most of the case the impact will not be significant.