2021 Ford P0455: What It Means & Is It Safe to Drive?
P0455 on the 2021 Ford: Evaporative Emission System Leak Detected (Large Leak). Here's what it means, what usually causes it, what repairs typically cost, and whether it's safe to keep driving.
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What this code means
A large leak has been detected in the EVAP system. Could be gas cap left off, disconnected hose, or damaged canister.
Common causes on the 2021 Ford
- Gas cap missing or not sealed
- Disconnected or ruptured EVAP hose
- Damaged charcoal canister
- Faulty purge/vent solenoid
Symptoms
- Check Engine Light
- Fuel smell possible
Typical fixes
- Install or replace gas cap
- Inspect and repair EVAP hoses
- Replace canister or valves as needed
Repair cost range
For a 2021 Ford, repairs for P0455 typically fall between $20 and $500, depending on the root cause and labor rates in your area.
Known issues on Ford
Ford P0455 on high-mileage models often means a cracked or rusted fuel filler neck causing a large EVAP leak. On F-150, the EVAP vent solenoid near the fuel tank is a known failure; gas cap is always the first check.
Most commonly affected models
F-150 2004–2014Explorer 2002–2010Mustang 2005–2014