A “large EVAP leak” sounds expensive. Sometimes it is a $15 cap — and sometimes it is not.
The cheapest diagnosis in the book, then the real one
P0455 means the fuel vapor system will not hold pressure. The number-one cause is a loose, cracked or missing gas cap — tighten or replace it, clear the light over a few drive cycles, done. When the cap is not it, a smoke machine finds the real leak: cracked EVAP hoses baked by heat, a failed purge valve, a rusty filler neck. Nobody should buy parts for an EVAP code without a smoke test first.
Quick tips
- Click the cap tight after every fill-up — no-cap fills set this code
- The light takes several drives to clear itself after fixing the cap
- Fuel smell in the driveway plus this code = get it smoke-tested
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