DX code PO446

BOBCIA

MEMBER
2001 CHEVROLET PRIZM
94,000 MILES

Car passed New Jersey DMV inspection post repairs to mass airflow issues with emissions.
Three weeks later engine light comes on again and DX was po446
EVAP emissions control system vent control circuit malfunction!
told to dismiss gas cap since it passed inspection but, look into

A) Failed EVAP vent solenoid.
B) Fuel saturated vapor canister(?).
C) Purge/vent solenoid(s) defective.
D) Connector and or wiring.

Runs well as of now but poor mileage.
the "sales people" suggested as smoke test as well as the cost amounts for suspected sensors.

How do I know where to start without losing arm and leg to prices of possible unnecessary work/parts.

3 Replies

CADIEMAN

MECHANIC
3,544 POSTS

There is a round plastic canister mounted under the hood on the left front inner fender. It either on top or it's underneath on the bottom. It has two hoses going to it and you will see a solenoid there to.

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Saturday, July 13th, 2013 AT 12:24 AM

BOBCIA

MEMBER
2 POSTS

This where I do initial check on "hoses/lines" for damage as well as the solenoid function?
I was told there's 1 in the air filter housing ($75.00), 1 in the gas tank ($175.00 just for part!)

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Saturday, July 13th, 2013 AT 6:43 AM

ASEMASTER6371

MECHANIC
52,797 POSTS

Good evening,

The most common cause for this is the canister vent valve being stuck closed. It is at the back of the car by the fuel tank. It is normally closed but commanded open by the ECM after the internal testing is done.

https://www.2carpros.com/articles/how-emission-control-systems-work

I attached pictures of the locations and possibilities for you to view.

https://www.2carpros.com/articles/smog-test-inspection-information

Roy

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Friday, April 10th, 2020 AT 4:02 PM

DX code PO446

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