Check Engine Codes / P0455
P0455 Code
Evaporative Emission System Leak Detected (Large Leak)
What it means
The EVAP system — which keeps fuel vapors out of the atmosphere — has a large leak. The most common cause is embarrassingly simple.
Can you keep driving?
Completely fine to drive. It's an emissions issue, not a mechanical one.
Common causes
Listed most-common first. Fix cost depends on which one it turns out to be — check your quote free below.
⚠️ Don't get ripped off
Check your gas cap before paying anyone. Loose or cracked caps cause a huge share of these. If a shop quotes hundreds without a smoke test, walk.
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Related codes
Informational only — codes share symptoms across vehicles, so proper diagnosis on your specific car always comes first.