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rx300 code P0440 what do I check?

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Old 02-15-10, 07:55 AM   #1
other cola
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Default rx300 code P0440 what do I check?

I remember seeing a posting related to that code before with pics as to what to check... now I can't find it. Any suggestions?
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Old 02-15-10, 09:27 AM   #2
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Quote:
Originally Posted by other cola View Post
I remember seeing a posting related to that code before with pics as to what to check... now I can't find it. Any suggestions?
http://www.clublexus.com/forums/rx-f...-po-446-a.html

It can be a gas cap, low amount of gasoline in tank or the charcoal canister among other things. I got one of those a few months ago. Disconnected the battery and all was well afterwards.
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Old 02-15-10, 03:29 PM   #3
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Do a search and you'll find that the system sometimes send P0440 Evap system codes for no reason, not necessarily a fault. Make sure the air filter housing and respective vaccum hoses are all properly connected and reset the code, I reset mine 1 year ago and never came back.

Highly unlikely that P0440 code is gas cap!
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Old 02-15-10, 03:52 PM   #4
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Originally Posted by Fern View Post

Highly unlikely that P0440 code is gas cap!
Should'nt it be the other way around?

That a loose/bad Gas cap is likely the cause of a P0440 code?
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Old 02-15-10, 04:21 PM   #5
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http://www.obd-codes.com/forums/viewtopic.php?f=1&t=570
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Old 02-15-10, 05:02 PM   #6
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The link you provided had 3 codes in it 440,441 and 446.
His problem was probably a bad Vsv at the canister side.

The OP has only the 440 code which is a leak detected in the fuel tank side.

P0440
After cold starting and when generating certain swift pressure
valve in fuel tank enabling not to hold that valve (2 trip detection
logic)

 Fuel tank cap incorrectly installed
 Fuel tank cap cracked or damaged
Vacuum hose cracked, holed, blocked, damaged or disconnected
((1) or (2) in Fig. 1)
 Fuel tank cracked, holed or damaged
 Charcoal canister cracked, holed or damaged
 Open or short in vapor pressure sensor circuit
Vapor pressure sensor
 Fuel tank over fill check valve cracked or damaged

^^As you can see the first 2 possibilities lies in the gas cap.
He could have other problems but the simplest way to find out is check his Gas cap condition first.
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Old 07-23-10, 11:04 PM   #7
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other cola,
was this problem resolve, i'm curious because i'm currently having the same fail code on my ES with just the P0440 code.
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Old 12-01-13, 07:25 AM   #8
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Default P0440 Lexus

I am swapping over the fuel cap from my Avalon to check if the problem lies with the fuel cap.
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Old 04-22-14, 10:47 AM   #9
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Default P0440, P0446, and VSC Light

Check the vacum hoses on air filter unit, terrible design function. So I just bought mt '02 RX300 last month with 101,000 miles on it in near perfect condition; one owner, grandma, all dealer maintained, all records = SCORE! However, after putting 4,000 mile on it in a month and a half I chose to get an oil change and tire rotation at Pep Boys in Lodi, CA for $24.99... Great deal and an oil change, any monkey can do that... Right? WRONG!!! After calling ahead to see if they could get it done in an hour, and getting assured that they could, I went down to get it done. After an hour and a half they came out to say that they were having trouble getting the filter out. Then after two hours they said all was done and I was ready to go. Two days later, my check engine light and VSC light came on, and needless to say I was upset after only making one payment so far. PB's offers free code reading so I took it in to get it read, codes came up P0040, P0046, and my VSC. PB said they then needed 150.00 to diagnose the issue, but having the codes I decided to take codes and do research myself and take it to the dealer if needed, as my confidence in PB was pretty low. After a google search I saw that someone else had this problem, and checked the air hoses under the car by the Charcoal Box, and no issue. Then I check the Air Filter box under the hood and sure enough, there was a hose on the back of the box that connected to another hose that runs under the car to the Charcoal Box... UNCONNECTED. Thats it, reconnect the damn hose and disconnect the negative terminal on the battery and ALL the codes are gone and gas mileage is back to +24mpg... Moral of the story... Do your homework before you pay.
I hope this helps save someone $$$ and stress. Fixed in 5 minutes work and 30 minute reset time.
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Old 04-22-14, 06:26 PM   #10
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^^^
Ditto.
The Tread Quarters coupon I had was too good to pass up.
I can't even buy oil and a filter for that price.
Of course they want to see if they can sell me an air filter and the hose in the back comes loose.
Next day the dash is lit up like a Christmas tree.
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