how to fix Ford Explorer Fifth Generation (2011-2019) EVAP leak

Ford Explorer Fifth Generation (2011-2019)

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

Error Code: P0455, P0456

3 min read

552 words

Problem Statement

Learn how to diagnose and fix EVAP leaks in Ford Explorer (2011-2019). Step-by-step guide with diagnostic procedures and repair instructions.

Error Code

P0455, P0456

Affected Component

Fuel System

Estimated Time

2-4 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the battery before working on electrical systems
•Ensure the vehicle is on a level surface and secured with wheel chocks when working under it

Symptoms

•Check engine light illuminated
•Fuel odor near the vehicle
•Failed emissions test
•Decreased fuel efficiency
•Hissing sound from the fuel tank area during refueling

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify specific EVAP-related codes
2
Visually inspect the EVAP system components, including hoses and connections for cracks, disconnections, or damage
3
Check the gas cap for proper sealing; ensure it is tight and in good condition
4
Perform a smoke test on the EVAP system to locate any leaks
5
Inspect the EVAP purge and vent valves for proper operation and electrical connectivity
6
Test the fuel tank pressure sensor with a multimeter

Solution

💡 Expert Tip

For complex repairs like this, consider taking photos at each step. This helps if you need to reverse a step or consult with a mechanic. Also, keep all removed parts organized - you may need to reference them during reassembly.

Verification

After completing the repair, verify that the issue has been resolved:

✓Test the affected component to ensure it functions correctly
✓Check for any error codes or warning lights
✓Monitor the vehicle for a few days to ensure the issue does not recur

Prevention Tips

To prevent this issue from occurring again:

•Follow the manufacturer's recommended maintenance schedule
•Address warning signs early before they develop into major issues
•Use quality parts and fluids recommended for your vehicle
•Keep detailed records of all repairs and maintenance

Tools & Equipment Required

•OBD-II scanner
•Pliers
•Hose cutter
•Socket set
•Torque wrench
•Smoke machine

Parts Required

•Replacement gas cap
•Replacement EVAP hoses
•New purge or vent valve

Related Faults

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Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify specific EVAP-related codes
2
Visually inspect the EVAP system components, including hoses and connections for cracks, disconnections, or damage
3
Check the gas cap for proper sealing; ensure it is tight and in good condition
4
Perform a smoke test on the EVAP system to locate any leaks
5
Inspect the EVAP purge and vent valves for proper operation and electrical connectivity
6
Test the fuel tank pressure sensor with a multimeter

Solution

1. Preparation

Gather tools and parts needed for the repair.
Disconnect the battery to prevent any electrical shorts.
Allow the vehicle to cool down if it has been running.

2. Inspect and Replace the Gas Cap

Tools Required: None specifically.
Remove the gas cap and inspect the rubber gasket for cracks or wear; replace if necessary.
Ensure the new gas cap is properly rated for the vehicle's year and model.

3. Repair or Replace Damaged Hoses

Tools Required: Pliers, hose cutter, replacement hoses (if damaged).
Locate damaged hoses identified during the visual inspection.
Use pliers to loosen the clamps and remove the damaged hoses.
Cut new hoses to the appropriate length and install them, ensuring secure connections with clamps.

4. Replace Faulty Purge or Vent Valve

Tools Required: Socket set, torque wrench, replacement purge/vent valve.
Remove the electrical connector from the faulty valve.
Unbolt the valve from its mounting point and remove it.
Install the new valve, securing it to the mounting point and reconnecting the electrical connector.
Torque the bolts to manufacturer specifications as per service manual.

5. Perform Smoke Test (if necessary)

Tools Required: Smoke machine.
Connect the smoke machine to the EVAP service port.
Activate the machine and observe for smoke leaks, sealing any identified leaks with appropriate materials.