Question 1

What does P0455 mean?

Accepted Answer

P0455 - EVAP System Leak Detected (Large Leak). EVAP system has detected a large vapor leak.

Question 2

What are the symptoms of P0455?

Accepted Answer

Check engine light, Possible fuel smell, No drivability issues

Question 3

What causes P0455?

Accepted Answer

Gas cap missing or very loose, Gas cap seal failed, EVAP hose disconnected, Purge valve stuck open, Charcoal canister cracked

Question 4

How much does it cost to fix P0455?

Accepted Answer

Typical repair cost: $0-$400. A 'large leak' often means the gas cap is missing or not tightened. Fixes P0455 over 50% of the time.

P0455 — EVAP System Leak Detected (Large Leak)

Don't guess — diagnose P0455 the right way