Tracking Down P0455 on Your 2021 Ford Explorer
A P0455 on your 2021 Ford Explorer means the system detected a large EVAP leak. Your 6th-generation Explorer on the CD6 platform is out of basic warranty but covered by the federal emissions warranty. Start with the gas cap.
What You'll Find
- Check engine light with P0455
- Faint fuel smell
- Gas cap seal showing wear after 4–5 years
- Emissions test failure
Causes by Probability
- Gas Cap Seal (Very High Likelihood): Early seal wear. $10–$25 OEM replacement.
- Canister Vent Solenoid (Medium Likelihood): Ford vent valve sticking. $140–$250.
- EVAP Hose (Medium Likelihood): Cracked vapor line. $80–$220.
- VMV (Low Likelihood): Ford purge valve. $100–$220.
- Fuel Sender Gasket (Low Likelihood): O-ring at fuel module. $100–$250.
What to Do
Replace the gas cap ($10–$25). Clear the code and drive 2–3 cycles. If P0455 returns, get a smoke test to locate the leak.
Warranty Coverage
Ford's basic warranty has expired. The federal emissions warranty (8yr/80k) covers EVAP through 2029. Contact your dealer.
Safe to Drive?
Yes. P0455 doesn't affect the Explorer's powertrain, 10-speed automatic, or AWD.