What causes a charcoal canister to go bad?

A charcoal canister can go bad due to several factors, including exposure to excessive heat, moisture, or contaminants that degrade the activated charcoal inside. Over time, the charcoal can become saturated with fuel vapors or damaged by chemicals, reducing its ability to capture and store vapors. Additionally, physical damage or cracks in the canister can lead to leaks, further impairing its function. Regular maintenance and timely replacement can help prevent issues with the charcoal canister.