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P0455: Large EVAP System Leak
The evaporative emissions system cannot hold pressure or vacuum during its self-test, indicating a large leak.
Common causes
- Loose or failed gas cap
- Split EVAP hose
- Stuck purge valve
- Cracked canister
This free page explains the code. A Shop Brief adapts the next steps to your year, make, model, and full code stack.
Related codes:
P0442P0401P0128 Pricing Sample brief