EVAP Vent Valve

Replace the EVAP vent valve, which controls the flow of air into the evaporative emissions system canister during fuel vapor purging.

Warnings

Tools required

Parts

• EVAP vent valve × 1 — Motorcraft CX-2471 or equivalent

Preparation

1. Park vehicle on level ground and engage parking brake
2. Allow engine and exhaust system to cool completely
3. Raise and safely support the rear of the vehicle on jack stands
4. Disconnect negative battery terminal to prevent fault codes during component replacement

Procedure

1. 1

   Locate the EVAP vent valve
   Position yourself under the rear driver's side of the vehicle. The EVAP vent valve is mounted to a bracket near the rear of the fuel tank, forward of the spare tire carrier. It is a small cylindrical component with an electrical connector and two vapor hoses attached.
2. 2

   Disconnect electrical connector
   Press the release tab on the electrical connector and carefully pull it straight off the vent valve. Do not pull on the wiring harness itself. If the connector is difficult to remove, use a small flathead screwdriver to gently assist the release tab.
3. 3

   Disconnect vapor hoses
   The vent valve has two vapor hoses: one from the charcoal canister and one venting to atmosphere. Press the quick-disconnect release tabs on each hose fitting and pull the hoses straight off the valve. Note the orientation of each hose for reinstallation.
4. 4

   Remove mounting hardware
   Remove the mounting bolt securing the EVAP vent valve to its bracket using a 10mm socket. The valve may be mounted directly to the bracket or may have a secondary clip arrangement depending on production date.
   Torque spec

   Mounting Bolts34 Nm (25 lb-ft)
5. 5

   Remove old EVAP vent valve
   Pull the vent valve away from the mounting bracket. Inspect the mounting bracket for damage or corrosion. Clean the mounting area with a shop towel if necessary.
6. 6

   Install new EVAP vent valve
   Position the new vent valve into the mounting bracket, ensuring it is oriented correctly with the electrical connector facing the proper direction for easy connection. The vent port (typically labeled or the smaller port) should face downward.
7. 7

   Secure mounting hardware
   Install the mounting bolt and tighten to specification using a 10mm socket and torque wrench. Ensure the valve is secure and properly seated in the bracket before final torquing.
   Torque spec

   Mounting Bolts34 Nm (25 lb-ft)
8. 8

   Reconnect vapor hoses
   Push each vapor hose firmly onto the corresponding port of the new vent valve until you hear or feel a click indicating the quick-disconnect fitting has engaged. Gently tug on each hose to verify secure connection. The canister hose connects to the inlet port, and the atmospheric vent connects to the vent port.
9. 9

   Reconnect electrical connector
   Push the electrical connector onto the vent valve until it clicks into place. Verify the locking tab is fully engaged by gently pulling on the connector body.
10. 10

    Restore battery connection
    Lower the vehicle from jack stands. Reconnect the negative battery terminal and tighten securely.

Reassembly

1. Ensure all vapor hose connections are fully seated and secure with no visible gaps
2. Verify the electrical connector locking tab is fully engaged
3. Confirm the vent valve is securely mounted with no excessive movement

Verification

• Start the engine and allow it to idle for 2-3 minutes, then turn off
• Use an OBD-II scanner to verify no EVAP system codes are present (P0440, P0441, P0455, P0456, P1450, etc.)
• Perform an EVAP system self-test using the scanner if equipped, or drive the vehicle through a complete drive cycle to allow the PCM to verify system operation
• Listen for any unusual hissing sounds near the vent valve location that might indicate a vapor leak
• Re-check all connections after the first test drive to ensure nothing has loosened

Related trouble codes on this vehicle

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