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What does 2evap code po446 emission control system vent circuit malfunction mean for a 2000 chevy impala?

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What does 2evap code po446 emission control system vent circuit malfunction mean for a 2000 chevy impala?

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the evap system is designed to allow un burned fuel vapor to be purged into the intake while driving also when fuel tank pressure reach to high for example hot day outside most common cause is the vent control solenoid located in the upper rear quater you can see it underneath.

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