On your Saturn it is likely a bad or loose fuel cap. Is there a lot of rust around the filler neck? If so try carefully removing it and then wiping the rubber gasket of the fuel cap with a bit of grease. Once you reset the code you need to drive the Vue for a a cycle in order to reset the sensor even though you have cleared the OBD code with a code reader.
A code P0442 most likely means one or more of the following has happened:
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