If you have the following codes on your Toyota Sequoua:
P0440
Evaporative Emission Control
System Malfunction
P0441
Evaporative Emission Control
System Incorrect Purge Flow
P0446
Evaporative Emission Control
System Vent Control
Malfunction
Your vacuum switching valve (VSV) may have failed. The two port version of this valve is Normally Closed (NC) and should not allow airflow when energized. If it gets stuck open you will have incorrect purge flow and trigger these codes!
