1997 Camry V6 has codes P0401 and P0402 so what should I replace?

What is your question?

My 1997 Camry V6 has codes P0401 and P0402. The VSV for EGR valve passes the 9V battery test. It is part 90910-12174. There are 2 similar looking parts in the same vicinity that I'm wondering about. They are VSV for EVAP and VSV for ACIS. Would either cause those codes? I hope that the problem isn't in the VSV built into the charcoal canister because in 1997 it's reportedly not a separate part.

What makes this problem better or worse?

car always runs fine

How long has your 1997 Toyota Camry had this problem?

6 months