Check engine light's been on for 3wks; 1998 GMC Safari what will it take to repair, see details
code readout came up: Emission Control System: PO446: Vent circuit half; PO452: Pressure Sensor low; PO453: Pressure sensor high.
Evap... Vacuum Switching Valve on canister Check this first and or replace clear and scan again. This system "helps" burn off HC's from the fuel tank.
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