Smog Check Manual – Visual Inspection Practice Test

In the Visual Inspection for the evaporative (EVAP) system, the focus is on obvious physical issues that could let fuel vapors escape. The key items to check are the evaporative canister lines, the purge valve, and the gas cap integrity. Visually inspecting these parts matters because cracks, breaks, loose connections, missing components, or a gas cap that won’t seal can all create vapor leaks or vent failures that show up as emissions problems.

Other components like spark plugs, oxygen sensors, or the catalytic converter aren’t part of this EVAP visual check; they relate to engine performance and other emission-control systems and aren’t the target of the VI’s EVAP inspection.