2001 Toyota corolla diagnostic code 0442?

Codes PO440,442

These codes represent failure or defect in the vehicles EVAPORATIVE EMISSIONS SYSTEM it keeps harmful fuel vapors from escaping into the atmosphere. This failure can range from a loose or defective Gas Cap or its Seal, to a leak in one of the plastic tubes that run from the fuel tank to the engine compartment and a charcoal canister where fuel vapors are stored.