CAPS LOCK Please....
Code #4 is Air Injection and I suspect that you have a bad vac. hose connection between the intake and the switch-over valves.
Take the front, top cover off [ in front of valve cover] and trace the hose where it passes the front of the engine.. Both the egr and air pump SOVs are fed vac from a common line. If this leaks/cracked, etc, both codes will display.