P0442 Code - Evaporative Emission Control System Leak Detected Small Leak

What Does P0442 Mean?

This indicates that a portion of the EVAP control system is no longer functioning properly. The EVAP system consists of components including (but not limited to) the gas cap, fuel lines, charcoal canister, purge valve, system pressure and flow sensors, electrical wiring and connectors, vacuum lines, the fuel tank, and fuel vapor hoses.

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What are the common causes of P0442 ?

• Faulty or loose fuel cap
• EVAP system line leak
• Charcoal canister leak
• Fuel tank leak
• Failed vent or purge valve

How do you troubleshoot P0442 ?

If all testing has passed so far yet you still have the same code, check your scan tool and see if it can open and close the IMRC valve. With the valve disconnected, the red voltmeter lead should be attached to the IMRC valve power wire and the black voltmeter lead connected to ground. Replace the oxygen sensor that is downstream from the catalytic converter on the side of the engine that does not contain cylinder #1. Also, if a oxygen sensor code stating "heater circuit malfunction" the sensor has most probably failed.

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