Engine code P1646 showed
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Posted on Jan 02, 2017
Oct 15, 2017 | Cars & Trucks
Did you check the block box connected to the vent solenoid? There's a hose that comes off it that appears to run nowhere, that's the fresh air vent. If it's blocked it won't allow air into the system which will set the trouble code. If that's clear, the vent solenoid itself is bad and needs to be replaced.
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