Redirect, it works only with one parameter

[eluser]TWP Marketing[/eluser]
You're correct.
Is your redirect() being issued before any attempts to load a view (or fractional view) to the browser?
For instance, do you load some header view(s) before making a conditional test for the existence of a page which might trigger redirect? I assume this conditional statement is in your controller.

Did you set $route['404_override'] for the default router to use on 404's?