DTC P1420: Evaporative Emission Canister Small Leak; DTC P1421: Evaporative Emission Canister Gross Leak [11/2016 - 10/2017]: Procedure

WARNING: This page is about a different car, the 2019 Toyota Highlander, 2018 Toyota Highlander, and 2017 Toyota Highlander. However, it is still accessible from the selected car via links, so may be relevant.