Quick checklist
Check gas cap seal and tightness inspect EVAP hoses for cracks
OBD2 Codes
P0442 – Evaporative Emission Control System Leak Detected (Small Leak)
Small leak detected in EVAP system; check gas cap first.
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Details
Small leak in the evaporative emission system. Most commonly a loose or damaged gas cap.
Typical causesLoose gas cap damaged gas cap EVAP hose leak purge valve leak
SymptomsCheck engine light may be intermittent
SeverityLow — usually just needs gas cap tightened or replaced
DIY checksCheck gas cap seal and tightness inspect EVAP hoses for cracks
ToolsNone required for gas cap check
Utilities
Copy-paste helpers
FAQ
Common questions
Can I ignore this code?
Not recommended—it can cause emissions test failure and fuel smell.