P0401 code a while.Replaced EGR valve, Vac Assy and VSV. Still on. on 2001 Toyota Solara

AFter replacing EGR light came on in 2 days. Vacuum assy 1 day, and vsv 1 day. Replaced air filter also. Hoses ok. Frustrated. Thank you.

Asked by for the 2001 Toyota Solara