P0442: Evaporative Emission Control System Leak Detected (Small Leak)

A small leak has been detected in the fuel vapor system.

Low Severity

$10 – $400

Typical repair cost range

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Can I Keep Driving with Code P0442?

Yes, the car will run normally.

What P0442 Means

P0442 is a more specific EVAP code than P0440, indicating a small leak roughly the size of a 0.040 inch hole. Most often it is a gas cap or a cracked hose somewhere in the EVAP system.

Common Causes

Diagnostic Tips

Replace the gas cap first if it is old. A smoke test will find any other leak.
Common on Toyotas, often the vent valve or charcoal canister.

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Frequently Asked Questions

Is P0442 serious?

Not at all. The only consequence is failing emissions testing.