P0455 Ford Bronco Sport
EVAP System Leak Detected (Gross Leak) · Powertrain Code · Medium · Repair: Easy
What is P0455?
A large leak has been detected in the EVAP system. Check gas cap first — if secure, look for disconnected or cracked EVAP hoses, a stuck-open purge valve, or a leaking charcoal canister.
When the Ford Bronco Sport triggers code P0455 (evap system leak detected (gross leak)), it typically points to an issue in the powertrain system. Below you'll find the most common causes, symptoms, and repair options specific to the Ford Bronco Sport.
This repair is rated easy, meaning basic tools, no lift needed.
Diagnostic data on this page is compiled from publicly available repair resources and technical service bulletins. Always have a qualified mechanic confirm the diagnosis before authorizing repairs on your Ford Bronco Sport.
Common Causes on Ford Bronco Sport
- Gas cap missing, loose, or severely damaged
- EVAP purge valve stuck open on intake manifold
- Large EVAP vapor line crack or disconnect
- Charcoal canister vent valve stuck open
- Fuel filler neck cracked or separated
Symptoms
- Check engine light illuminated
- Noticeable fuel smell near vehicle
- Gas cap warning light on dashboard
- Failed emissions test
- Fuel economy noticeably decreased
Notes for Ford Bronco Sport
Escape and Bronco Sport P0455 is most often a gas cap issue. If the cap is fine, perform a smoke test to find the large leak source.