Question about 2004 Lexus LS 430

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2000 lexus es300 error code p0440, p0441, p0446

Hello, i had the check engine light come on again, and this time, 3 error codes popped up at once. any help would be appreciated. i recently changed the sensor at the front of the motor and the one under the car by the catalytic converter. everything going good for the last few weeks. now 3 errors codes. car still runs ok :) Thanks Todd

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P0440 Evaporative Emission System, P0441 Evaporative Emission System Incorrect Purge Flow , AND P0446 Evaporative Emission System Vent Control Circuit

Posted on Apr 23, 2009

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I have a es300 with a 0446 code and I am told I need a vacuum switch. Where is the vaccum switch located? I have ordered the part (without the canister) and I hope I can figure out which switch it is. Please answer.

Posted on Jul 23, 2012

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You replaced the wrong sensor. Here is a link that can further explain how to trouble shoot this problem http://us.lexusownersclub.com/forums/lofiversion/index.php/t14194.html

Check for Vacuum hose for leak,crack or blocked first then, Vacuum switch Valves for vapor pressure sensor next to the Evaporator Charcoal Canister rear of the fuel tank. Charcoal Canister crack or damage. But mostly likely Charcoal Canister and vapor pressure sensor replacment. Tell us the result.

Posted on Feb 20, 2010

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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.


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Car codes


When you have P0440, P0441 and P0446, it is a very good bet that the fuel cap was loose, or the fuel cap rubber seal is compromised. You will get all three of those codes every time that the cap is loose. Always make sure that the fuel cap is as tight as you can get it after you refuel.

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