Codes p0440-p0441 -p0446
Eva system. I'm guessing a PCV needs cleaned or replaced. Sometimes the gromet that it sites in gets briddle and cracks and you can lose vapors that way also
SOURCE: 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.
SOURCE: 2000 lexus es300 error code p0440, p0441, p0446
P0440 Evaporative Emission System, P0441 Evaporative Emission System Incorrect Purge Flow , AND P0446 Evaporative Emission System Vent Control Circuit
SOURCE: my check engine light come up w/ all these code
po305 is related to missfire on #5 cylinder
po440 is related to fuel tank pressure
pO441 is for evaporator purge flow malfunction
po446 relates to vent control valve electrical circuit malfunction
missfire is seperate from the other codes
as for the other three codes replace the vent control valve solenoid located near the charcoal canister the oth3er codes can relate to a faulty solenoid
after replacing light will only go out if you clear through a scan tool or three drive cycles of over 10 min each
SOURCE: 99 lexus GS-400 P420, where is the O2 sensor? Need Pics not words
Below is a picture of the location of both O2 sensors for your vehicle. Also the last picture is your evap. system. In the "dotted lined" area I would check for rotten or lose hoses in that area as well the vapor pressure sensor could be faulty as well. Hope this helps.
SOURCE: what is an evaporative control system in a lexus 2002
The computer vents vapors in the gas tank to the vapor canister while the engine is running by opening valves.
Based on the codes you have, one of the valves or solenoids is not working correctly and would need to be tested.
The mechanic would use the test procedure for each code to troubleshoot the problem.
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