HEELP HLP WIT THIS MESAGE THANK U

I WILL LIKE TO SEE A PIC OF THE PART PO 401 I WEN TO GET FREE CHECK UP ON CAR BEFORE SMOG IT COMES OUT AS MIL IS COMMANDED ON SECOND IS PO 401 EGR FLOW INSUFFICIENT DETECTED WHAT DOES THAT MEAN AND HOW CAN THAT BE FIX OR REPLACE THANK U I HAVE TOOKEN MY VECHILE TO SHOP 3TIMES AND PAID TO HAVE IT FIX STILL SHOWS UP AS NOT BEEN REPAIRED