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This code indicates a 'small leak in evap system' . - Simplest and cheapest solution is usually fitting a new gas cap. If that doesn't do it look for a loose or broken small vacuum pipe in the engine bay. Also possible that evap canister is faulty.
As you don't give type and year of vehicle its very difficult to diagnose further.
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∙ 11y ago
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P0442 OBD-II Trouble Code?
Trouble code P0442 means: Evaporative emission control system, small leak detected
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