P0412

Hello. New here. I have a 2013 4.6 V8. with code P4012. Late last year, I had P2432 and changed the bank 1 / driver side valve on top. That one was easy. For 0412, I can't tell which part to change in this dreaded emissions system mess. Is this the valve up under the wheel well area that has the bulb type of housing known for water problems or is it something else like the more difficult one under the intake manifold? Considering the bypass kit, but also willing to change the part if I could narrow down which one it is within the system. Thanks for any advice.