I AM TOLD THAT I NEED TO REPLACE THE CANISTER #77740-48080. WHAT IS THE CAUSE
EMMISION REPAIR, on 2003 Toyota Highlander
The charcoal canister is part of the emission control system it stores gasoline vapor to prevent the vapor venting to the atmosphere. Gasoline vapor is carcinogenic and is harmful to the atmosphere. The gasoline vapors are stored in the canister and drawn into the engine under certain conditions when the engine is running in a way which does not cause any drivability issues when you are driving. When the canister fails the gasoline vapors are not drawn into the engine properly or are vented to the atmosphere which does not comply with federal emission laws.