Did you fuel your car with the enigne running?
Is the gas gap on tight?
Not to worry, ususally the above 2 items are the cause and if so, the code will reset itself after a certain number of complete cycles and a self re-test. Or you can clear the code yourself if you've got a scan tool. Perhaps Autozone (et, al) can do it for you.
If the 442 does not go away after a couple of weeks (or after a reset) then you may have a loose, leaking hose from the tank to the canister.
DEWFPO
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1998 S90 071,245 and 1995 964 154,100
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