Question about 2002 Chevrolet Prizm

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1998 toyota corolla dtc# p0441 and p0446

Would a leaking exhaust gasket from the exhaust pipe to exhaust head cause the p0441 and p0446.

I have already replaced the charcoal canister and vsp. I did an ohm check on the two oxygen senors per the toyota shop manual , they read ok. Gas cap seems tight , don't know how to test that.

Bill

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  • wbrenner Feb 18, 2009

    Replaced the exhaust gasket, disconnected battery to clear codes, drove 100 miles and trouble code light returned. I had the state emissions test, failed with code PO420 Catalyst System Efficiency Below Threshold ( Bank 1) this time. I am thinking bank one oxygen sensor even through the resistance check was in the eceptible range.



    Bill

  • Anonymous Mar 28, 2014

    when shift into reverse makes noise sounds like exhaust leak recently had head gaskets replaced

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Yes it would cause these Codes.

Posted on Jan 15, 2009

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usually you will see p0440 p0441 and p0446 together but before anything replace your gas cap and besure to tighten it down when you gas up the vehicle, 90% of the time with those codes either a loose gas cap of bad gas cap gasket is the problem

Otherwise - Might be a canister leak, defective VSV valve or hoses, bad gascap seal.

Thanks for using FixYa - a FixYa rating is appreciated for answering your FREE question.

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3 Answers

P0440,p0441,p0446


These codes are all for the Evaporative Emissions System.

P0440- Evaporative emissions system fault- just saying there's something wrong with the system.

P0441- Evaporative emissions system- Incorrect purge flow- saying that the system isn't purging the raw fuel vapors (hydrocarbons- HC) as well as it should.

P0446- Evaporative emissions system- Control valve circuit low- there is a valve, usually located on the charcoal canister at the rear of the vehicle, that opens to allow fresh air to enter the evaporative emissions system as the engine vacuum purges the fuel vapors from the charcoal canister and closes when purge is not needed to prevent leakage of those fuel vapors to the atmosphere (HC is a greenhouse gas and is regulated as such by the fed gov't).

Given that you have the incorrect purge flow code and the control valve code together, my bet is that the vent control valve has failed (causing the P0446) and is not opening to allow fresh air into the system to displace the air from within the system that is being pulled to the engine. Since you have no fresh air entering the system, the engine will pull a vacuum on the system instead of the vapors "flowing" into the engine (causing the P0441).


I hope that this is helpful to you!!!


ASE Master Technician with L1 and X1 Certifications; Nissan Scope Technician; Chrysler Level 3 Silver Technician- 12+ years experience.


Nov 17, 2008 | 2001 Toyota Corolla

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