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A 2009 mile Buick Buick km, with mileage of about 70 thousand. User response: the engine fault lamp frequency is lit up, the trouble code is removed, symptoms disappear, but it will appear for some time. After receiving the vehicle: the diagnostic system is used for self diagnosis of the engine system. There is a historical fault code P0445, which means the EVAP system is seriously leaked. Clear the trouble code and the engine fault lights go off. The test is half an hour, and the fault is reproduced. Consult the maintenance manual, P0445 related contents are as follows: