P0442 means that there is a small leak in what is called the evap system What it dose is take gas fumes from the fuel tank and divert them to the charcoal canaster to be burned in the combustition system routed through two solinoid valves called the canaster vent valve and the canaster purge valve the vent being from the tankto the canaster and the purge being canaster to the combustion chamber Its a small leak it could be anyware in the system but i would replace the gas cap first many times it starts to leak at the seal and will set this code Its all for emissions and dosn;t have a large effict on over all proformance unless you need to pass emissions
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