What is the visual cue for an EVAP bypass or removal?

• A. Missing purge valve, open lines, or non-connected hoses.
• B. Gas cap missing.
• C. O2 sensor relocated.
• D. Canister warmed.

Answer: (A)

EVAP bypass or removal shows up in the visual inspection as components being missing or hoses not connected. The purge valve is a key part of the EVAP path that normally connects the charcoal canister to the intake and allows vapors to be drawn in when the engine is running. If the purge valve is missing and the lines are open or not connected, there’s no solid path for vapors to travel through the EVAP system, which is a clear sign that the system has been bypassed or removed.

Gas cap missing can indicate an EVAP leak, but it doesn’t demonstrate that the EVAP system itself has been bypassed or removed. Relocating an O2 sensor isn’t related to the EVAP circuit, and a canister warmed status doesn’t imply bypass or removal. The presence of missing purge hardware or disconnected hoses is the most direct visual cue that the EVAP path has been bypassed.