Question

P0446 on my 2004 Toyota Tacoma what could it be other than gas cap at its location?

Answer 1

Could be the "Vapor Pressure VSV" and/or "Canister". There are some tests that need to be performed to accurately diagnose the problem. See "Tech Notes" on the code page and read the bulletin from the factory to help you determine what the problem is.

 P0446 Toyota - EVAP System Vent Control Circuit
Read more: https://www.autocodes.com/p0446_toyota.html