Question about 1999 Lexus ES 300

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99 Camry, P0441 & P0446 codes

I purchased a CanOBD2 code reader to see what the codes are so I can look into repairing the problem myself. The gas mileage may be off a bit but the car otherwise starts, runs, and drives normally at all speeds and under all conditions. The gas cap used to have pressure but now it doesn't, and I always make sure the cap is sealed properly (three ''clicks''). My friend used to drive it and he had a tendency to overfill the tank so it may have triggered the codes. The gas cap is the stock Toyota unit and I've never had it pressure tested. I don't want to replace it unless it's defective.

Since only 441 and 446 codes are present I'm thinking there's a bad valve/switch in the evap canister but wanted to check here first. How much of a job is it to repair this problem? I don't have a service manual so perhaps someone could post a diagram or direct me to a site where I could purchase a manual on the cheap since my budget is really tight right now.

Thanks sincerely for your help. :)

Hi Toyota Ed, Could you please send me the solution for the p0446 code issue on a 99 es300?

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  • Toyota Ed May 11, 2010

    Hi! The solution provided by Bunnydawg is very good.

    Please respond back to us if you need further assistance.



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A. Diagnostics for PO441:

1. Remove Vacuum Hoses between EVAP VSV and Charcoal Canister and discard.
2. If there is a metal vapor pipe between EVAP VSV and Charcoal Canister, clean inside of vapor
3. Replace EVAP VSV and Charcoal Canister assembly with new parts.
4. Install new vacuum hoses between EVAP VSV and Charcoal Canister.

B. Diagnostics for P0446:

1. Inspect vacuum hoses and pipes between EVAP (Purge) VSV and Charcoal Canister for leaks.
2. Replace Vapor Pressure VSV and Canister.
NOTE :When performing diagnostics for an occurrence of a MIL "ON" condition, Diagnostic
Trouble Code (DTC) P0441 may be result of debris in Evaporative Emission Control System. This
may cause blockage of a vapor line, or a stuck VSV, as described in troubleshooting area of Repair


Posted on Jan 29, 2009

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Change your gas cap

Posted on May 24, 2011


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Posted on Jan 02, 2017


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SOURCE: 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.

Posted on Nov 17, 2008

Ted Schore

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SOURCE: Code P0441 and P0446. What does it mean?

Both codes are with the EVAP SYSTEM, there are numerous items it could be. A repair shop that does Toyotas or the delaler would be the best to check it out for you. Its not anything that will leave you walking or disable the car.

Posted on Nov 13, 2009

Toyota Ed

  • 1861 Answers

SOURCE: 99 Camry, P0441 & P0446 codes

Sent it to you this morining. Hope that it helps. Thnaks for choosing FixYa to solve your issue.

Posted on Dec 04, 2008

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How to fix whatever caused the codes P0441, P0442,P0446

Check and make sure your gas cap is screwed on tightly. Then, check the vacuum lines are attached correctly and not leaking. I would bet one of the hoses came off or you have a hole in one or more. The hoses split with age. Start with these, before changing sensors or solenoids.

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They are three separate issues.
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I think you have a defective fuel pump pressure check valve here. If you don't have a check engine light on you will not have any codes.

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Have codes P0441, P0442, and P0446. What could be the problem?

this obd2 trouble code table can help you understand the meaning of code.
and for p0441, you can try:
Repair damaged EVAP lines or canister.

Repair open or short in voltage feed circuit to Purge Solenoid.

Repair open in PCM purge command circuit.

Replace purge Solenoid.

Replace vacuum switch.

Repair restriction in Evap line or canister or soleniod.

Repair resistance in purge connector.

Replace PCM.

for p0442

Remove and reinstall the gas cap, clear the codes, and drive for a day and see if the codes come back.

Otherwise, replace the gas cap, or

Inspect the EVAP system for cuts/holes in tubes/hoses.

Aug 15, 2011 | 2003 Toyota ECHO

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Gas mileage is terrible,check engine light on,put on computer by friend said o2 sensor -i wasnt sure my friend new what he was doing so took to auto zone now they say the computer wont read

auto zone reader will sometimes not read codes. take it to your local garage and ask them to plug into it with an updated reader. i dont charge to read a code and i would hope they dont either. the o2 sensor could cause bad gas mileage. whens the last tune up done? check air filter. plugs? also check air in tires. low tires can cost fuel mileage as well. hope this helps

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Both codes are with the EVAP SYSTEM, there are numerous items it could be. A repair shop that does Toyotas or the delaler would be the best to check it out for you. Its not anything that will leave you walking or disable the car.

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Engine light on code is po440

P0440 Fuel tank vapor emission problem.
Could be as simple as a leaky gas cap.....or a missing gas cap.

Have you purchased gas and left the engine running as you filled it?
That will turn on the light too.

The P0440 is one of the most common codes and pops on the dash of 50% of cars on the road as they get older on a weekly basis.
An extremely small vapor leak on the fuel system will pop this code on.
Most of the time.....this code cannot be fixed......the answer is to buy a cheap OBD2 code reader and remove the code yourself every time it pops on........and on the 50% of cars with shows up about 2 times a week.
When the engine light is on,you will loose 20% of gas mileage and has 20% higher turn it out!
Some cars will not go into overdrive with this light on.

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