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Car can be driven around town for weeks but usually a trip on the highway for 15minuts to one hour produces the P0442 code. Any trouble-shooting suggestions would be appreciated

Vehicle: 2001 Subaru Forester 2.5l

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P0442 Evaporative emission control system leak detected ( Small Leak)

Start out by doing a visual small leak check the fuel cap

 Here a fuel cap where its seal shows torns which results in evap small leaks

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