OBD code P0442

The ECU has detected a small fuel-vapor leak in the EVAP system.

Estimated severity

Low

Common symptoms

Check engine light on, usually with no clear driving symptoms
Occasional slight fuel smell near the vehicle

Likely causes

Fuel cap not tightened properly or hardened seal
Small cracks in EVAP hoses or connections
Leaks in the charcoal canister or fuel tank area
Purge valve or vent valve not sealing fully

Recommended checks

1. Tighten the fuel cap correctly and clear the code to see whether it returns.
2. Inspect visible EVAP hoses for cracks or damage.
3. Check the canister and connections for leaks.
4. In a workshop, use a smoke machine to find the exact leak.

What does code P0442 mean?

P0442 points to a small leak in the evaporative emissions system. The system can detect very small pressure losses in the fuel vapor circuit. It usually has little effect on driving, but it affects emissions and can cause diagnostic or inspection failures.

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