P CODES (POWERTRAIN) P1400 - P1499 P1450 Questions

Got A Check Engine Light That Spit Out The Following Codes:p0401-exhaust Gas Recirculation Flow Insufficient And P1450-unable To Bleed Up...

It Just Started The Car Runs The Same

I Got This Code And When I Researched It, All The Sites Said To Replace The Purge Valve. So I Did. But Two Weeks Later The Code Came Back....