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P0440 P0xxx · パワートレーン (P) 重大度低
Evaporative Emission Control System Malfunction
The EVAP system failed its overall integrity check. Fuel vapour is escaping somewhere between the tank and the charcoal canister.
重大度の目安： 低 — 通常は走行性への影響なし。次の定期点検時に対処してください
確認できる症状
- Fuel smell around the vehicle
- Check-engine light
- Failed emissions test
- Occasional rough idle after refuelling
主な原因
可能性の高い順に並んでいます。上から順に確認してください。
- 1 Loose, missing or damaged fuel cap
- 2 Cracked vapour hose
- 3 Failed purge or vent solenoid
- 4 Leaking charcoal canister or tank seal
点検・修理の手順
費用が安く侵襲の小さい項目から — これらのコードの大半は部品の問題ではありません。
- ✓ Check the fuel cap first — it is the single most common cause and costs nothing.
- ✓ Smoke-test the EVAP system at the service port; leaks show up in seconds.
- ✓ Command the purge and vent solenoids with a scan tool and confirm they hold vacuum.
- ✓ Inspect the filler neck and tank seam for rust.
修理の選択肢
- Replace the fuel cap
- Repair the leaking hose or seal
- Replace the vent or purge solenoid
P0440 — よくあるご質問
Is it dangerous to drive? +
Generally not, but a large leak is a fire risk and will fail inspection. Fix it reasonably soon.
Why does it come back after refuelling? +
A cap that does not seal or a damaged filler neck — the system detects the leak right after the tank is opened.