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Old 11-25-14, 08:23 PM   #1
Hornet
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Default Code PO446

Hi
My car had check engine light on
I had checked it via diagnosis system, it shows code PO 446
Does any one knows what that mean ?? And how. To repair it

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Old 11-25-14, 10:56 PM   #2
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Dude, If u even bothered to search u would have seen that it has to do with your evap system. Check your hoses for leaks, if that's good it's prolly your charcoal canister
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Old 11-25-14, 11:28 PM   #3
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http://www.obd-codes.com/p0446

Google man, found it in about 15 seconds...
the link should give you some insight..
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Old 11-27-14, 05:55 AM   #4
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Had it happen to me before need it to get fix to pass inspection it's the charcoal canister it's a big square canister under rear of car near exhaust looks like black shoe box
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Old 11-27-14, 07:38 PM   #5
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Quote:
Originally Posted by gsean400 View Post
Dude, If u even bothered to search u would have seen that it has to do with your evap system. Check your hoses for leaks, if that's good it's prolly your charcoal canister
Thanks for reply mate
But Which Hoses ? The air hose ( breathing hose ) or evap hoses
And is there any cosiqurnces of I ignore it ?

Regards
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Old 11-27-14, 07:39 PM   #6
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Quote:
Originally Posted by Scott610 View Post
Had it happen to me before need it to get fix to pass inspection it's the charcoal canister it's a big square canister under rear of car near exhaust looks like black shoe box

Thanks a lot brother
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Old 11-28-14, 03:37 AM   #7
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Originally Posted by Hornet View Post
Thanks for reply mate
But Which Hoses ? The air hose ( breathing hose ) or evap hoses
And is there any cosiqurnces of I ignore it ?

Regards
Yes, the evap lines. When I had that code, in the engine bay driver side, I had an evap hose that had disconnected. I just put it back on and the engine light went away. You would fail emissions if u didn't fix it
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Old 11-28-14, 03:05 PM   #8
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vent solenoid is sticking. time for a new one.
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Old 11-28-14, 04:08 PM   #9
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It could be a number of things, most have already been mentioned. I would start with the least expensive items first. Replace the gas cap, use OEM. Then I would check for a faulty or loose evap hose. Check the ones under the hood first. Follow the hose all the way to the canister. The hose connected to the canister had worked its way loose when I was getting that code. If that doesn't work, next I would replace the solenoid that is on the canister. If those things don't work, then I would replace the canister. It's the most expensive part and it is just as likely some of those other things as it is the canister.

Other than failing to pass inspection, it will not harm the car if it is not corrected.
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Old 12-01-14, 11:15 PM   #10
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Quote:
Originally Posted by Hornet View Post
Thanks for reply mate
But Which Hoses ? The air hose ( breathing hose ) or evap hoses
And is there any cosiqurnces of I ignore it ?

Regards
I've been too lazy to attempt the long hours to fix, I've had that code for about 3 years now... Car runs fine, just gonna get very bad gas mileage. However, most likely its a sticky valve, the canister itself usually is fine, theres a write up on how to do the exchange, it requires dropping the differential though to get to it. Here's the parts:

http://lexus.sewellparts.com/oem-cat...S400-2000.html

Click the image to open in full size.
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Old 12-01-14, 11:41 PM   #11
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no need to drop the differential...


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Here is how I did it without messing with the rear hub and rear control arms, please refer to the diagram below.
I did not take pics, it was very dirty under there and dirt was landing on my face.
Once I had the car jacked up I was done in 90 minutes...
  • Jack up and properly support the passenger side rear of the car.
  • Remove passenger side rear wheel.
  • Remove the rear suspension brace, both sides.
  • Removed the 3 nuts that hold the canister and disconnecting 3 hoses and the 2 connectors.
  • Remove the charcoal canister mounting bracket, 2 bolts on the right side of the assembly.
  • Remove the 6 10mm allen head bolts that hold the RH rear drive shaft to the differential. Mark the alignment of the axle to the differential.
  • Carefully push the axle outward and drop it down to the side.
  • Remove the rubber band type hangers that supports the exhaust pipes. this will give you enough room to move the drive shaft a few more inches out of the way.
  • Remove the charcoal canister assembly. It might take you a few minutes to fit it through the opening.
  • Replacing the new assembly is reverse of removal, including removing the mounting bracket on the right side of the assembly.
  • Torque the drive shaft bolts to 61 ft/lbs in a cross pattern

Click the image to open in full size.
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Old 12-02-14, 09:27 AM   #12
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Quote:
Originally Posted by ttaylor993 View Post
It could be a number of things, most have already been mentioned. I would start with the least expensive items first. Replace the gas cap, use OEM. Then I would check for a faulty or loose evap hose. Check the ones under the hood first. Follow the hose all the way to the canister. The hose connected to the canister had worked its way loose when I was getting that code. If that doesn't work, next I would replace the solenoid that is on the canister. If those things don't work, then I would replace the canister. It's the most expensive part and it is just as likely some of those other things as it is the canister.

Other than failing to pass inspection, it will not harm the car if it is not corrected.
Thanks millions for this comprehensive details
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Old 12-03-14, 04:28 PM   #13
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had the same code Just replaced my evap and passed smog also
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Old 12-03-14, 06:47 PM   #14
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This post has the service and diagnostics pdf.

http://www.clublexus.com/forums/gs-s...0446-evap.html

it's too easy to think everyone else's problem is your problem. and it's too hard to re-write like a checklist of things to check, when you may forget and miss one.
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Old 12-04-14, 04:01 PM   #15
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just a p0441 code means your VSV is "Open" check your evap line going to the VSV.

just a p0446 code means charcoal canister is stuck closed.

sounds like a clogged charcoal canister.

http://www.eecis.udel.edu/~davis/070...b/LexusVSV.pdf
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Old 12-04-14, 04:01 PM
 
 
 
 
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