how to close evap vent solenoid without scan tool

Closing the EVAP (Evaporative Emission Control System) vent solenoid without a scan tool can be done manually, but it’s essential to understand that this is typically not recommended. The EVAP system plays a critical role in controlling harmful emissions from your vehicle, and tampering with it can lead to increased pollution and may not be legal in some areas. If you suspect a problem with your EVAP system, it’s best to diagnose and address the issue correctly.

However, if you have a specific reason for temporarily closing the EVAP vent solenoid (e.g., for testing purposes), here’s how you can do it manually:

Warning: This procedure is for testing purposes only. Do not drive your vehicle with the EVAP vent solenoid closed for an extended period. Ensure that you understand the potential consequences of tampering with the EVAP system before proceeding.

Tools Needed:

  • Safety glasses and gloves (to protect your eyes and hands)
  • Pliers or a suitable tool for squeezing or clamping hoses


  1. Safety Precautions:
    • Put on safety glasses and gloves to protect yourself.
  2. Locate the EVAP Vent Solenoid:
    • The EVAP vent solenoid is typically located near the charcoal canister, which is often situated under or near the rear of the vehicle. You may need to consult your vehicle’s service manual or repair documentation to locate it precisely.
  3. Identify the Vent Hose:
    • Identify the hose connected to the vent side of the EVAP vent solenoid. This hose leads to the atmosphere and allows air to flow in and out of the EVAP system.
  4. Squeeze or Clamp the Hose:
    • Using pliers or a suitable tool, gently squeeze or clamp the hose connected to the vent side of the solenoid. This action will block the airflow through the hose, effectively closing the vent.
  5. Test as Needed:
    • With the hose closed off, you can conduct the necessary tests or procedures that require the vent to be closed. Ensure that you have a specific reason for doing this and that it’s safe and legal in your situation.
  6. Remove the Clamp or Release the Hose:
    • Once you’ve completed the testing or procedure, remove the clamp or release the hose to allow the vent to function normally.
  7. Check for Error Codes (Optional):
    • After reconnecting the hose, you may want to check for any diagnostic trouble codes (DTCs) using an OBD-II scan tool to ensure that the EVAP system is functioning correctly.

Please note that manually closing the EVAP vent solenoid should only be done temporarily for testing or diagnostic purposes. It is not a recommended solution for addressing ongoing issues with the EVAP system. If you suspect a problem with your vehicle’s EVAP system, it’s best to have it diagnosed and repaired by a qualified mechanic to ensure that it complies with emissions regulations and operates safely.

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