You are offline — AutoTools still works from your device.

Code

P0455

Evaporative emissions

Large leak in EVAP system

A large leak is detected in the fuel vapor system.

Search another code

Most likely causes

Fuel cap missing or loose
Split EVAP hose
Purge valve stuck open

Symptoms you may notice

Check engine light
Fuel smell

Checks to run

Check the fuel cap first
Smoke test the system

Tools you may need

Smoke machine

Always diagnose before replacing. Codes share symptoms; confirm the cause with measurements before buying parts.

Related codes in Evaporative emissions

Small leak in EVAP system

EVAP vent valve control circuit malfunction

Very small leak in EVAP system

EVAP pressure sensor high input

EVAP purge system flow during non-purge

Ask the AI mechanic

Hi! Ask me anything about your car — codes, noises, parts, maintenance.