Where is the charcoal canister on a 99 Buick Century?

On a 1999 Buick Century, the charcoal canister is located near the rear of the vehicle, typically mounted to the underbody near the fuel tank. It is part of the evaporative emissions control system, designed to capture fuel vapors from the gas tank. To access it, you may need to lift the vehicle or remove some underbody panels for better visibility.