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P0442 P0xxx · 动力总成（P） 低严重度
Evaporative Emission Control System Leak Detected (Small Leak)
A small leak — typically equivalent to a 0.5–1 mm hole. Harder to find than a gross leak, and the smoke machine is the only realistic tool.
严重程度说明： 低——通常不影响行驶，下次保养时处理即可
你会注意到的故障现象
- Faint fuel smell
- Check-engine light
- Failed emissions test
常见原因
按可能性从高到低排列——从最上面开始查。
- 1 Perished vapour hose
- 2 Loose or worn fuel cap seal
- 3 Cracked charcoal canister
- 4 Corroded tank vent line
如何排查
先做花钱最少、侵入最小的检查——大多数这类码不是零件问题。
- ✓ Replace or re-seat the fuel cap and re-run the monitor if you can.
- ✓ Smoke-test at low pressure and watch for the thinnest wisp.
- ✓ Inspect the canister and all hose ends under the vehicle.
- ✓ Check the filler neck seal and vent line for rust.
维修方案
- Replace the leaking hose
- Replace the fuel cap
- Replace the charcoal canister
P0442 —— 常见问题
Why is a small leak harder than a big one? +
The leak is near the monitor's threshold, so visual inspection almost never finds it. Smoke is the reliable method.
Can I ignore it? +
It will not strand you, but it fails inspection and wastes fuel vapour. Fix it when convenient.