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Posts Tagged: P0442 Evaporative Emission Control System Leak Detected

Fix codes P0442, P0456 on Ford

Fix codes P0442 P0456 Ford P0456 Evaporative Emissions System – Small leak detected P0442 Evaporative Emission Control System Leak Detected (small leak) These codes indicate that the Evaporative Emissions System has failed a leak test. To perform the test the computer energizes the vacuum management valve (VMV) vent valve. That opens the fuel system to fresh air. Then it opens the VMV purge valve. That opens the system to engine vacuum. The engine sucks fresh air into the charcoal canister to purge all the gas vapors collected inside. The computer … Read More


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