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Error code P0446 in a 1996 Honda Passport indicates a problem with the evaporative emission control system (EVAP), specifically related to the vent control circuit. This could be caused by a clogged or faulty EVAP vent valve, a damaged or disconnected vacuum line, or an issue with the engine control module (ECM). Additionally, a loose or damaged gas cap can also trigger this code. It's important to diagnose the specific component causing the issue for proper repairs.

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1mo ago

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The code PO441 means that the vehicle has an incorrect purge flow. The code PO446 is for the vsv vapor pressure sensor.


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Your gas cap may have been left loose or the oring on the cap needs replaced unless you have lost it. If this is the case do yourself a favor and buy the thirty dollar Lexus replacement