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Old 04-10-2012, 05:06 PM   #1
Scooby Newbie
Member#: 111917
Join Date: Apr 2006
Location: Parsippany, NJ
2006 WRX Limited
Aspen White

Default Return of the P1443

Background: A couple months ago, my 06 WRX threw P1443 code and was giving me a very tough time refueling. Gas pump kept clicking off unless it was only a trickle. After a bit of research, I decided it was likely, as the title of the code suggest as well, the Vapor Vent valve. After removing the charcoal canister to access it, I replaced the valve. Cleared the code and it seemed like the problem was solved. CEL didn't come back and I was refueling normally.

A few days ago, I ran pretty low on fuel and the CEL came back. I cleared it and it came back again. Now my NJ emissions inspection is due this month so I'm facing a bit of a deadline...thoughts?

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Old 04-10-2012, 11:31 PM   #2
r mando
Scooby Newbie
Member#: 315778
Join Date: Apr 2012
Chapter/Region: NWIC
Location: sedro woolley
wrx hawkeye


when you pulled it apart was there anything inside the canister? water? gas?

the valve you replaced was inside the canister right? i know they don't sell them individually

did you get it from a junkyard or something?

did you check the connector wires/pins of the valve?

did you check all the hoses for blockages?
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Old 04-13-2012, 02:49 AM   #3
Scooby Newbie
Member#: 160425
Join Date: Sep 2007
Location: Texas
2004 Impreza Outback


Is your vehicle hard to start up after fueling?

I had this issue come up numerous times, and after having shops replace every single valve in the emission system contained near the fuel door, I determined to go with my original instinct, that it was my charcoal canister itself.

Take the canister off the car, disconnected from any tubing, and turn the piping in/outlets to the ground and shake it a bit. Any powder falling out? entire pellets? If so, get yourself a replacement canister, and consider cleaning the tubing out, to ensure that no charcoal powder/pellets are stuck in the system still.

I was noticing a subtle click before the CEL P1443 came on, and I'm sure that just enough powder had vented out and clogged up a valve or the solenoid. After replacing the canister with a brand new one, I have put almost 10,000 miles on the car without further incidents.

My only symptoms were (in order of frequency)
• CEL P1443 (every time, of course)
• Fueling up would cause vehicle to resist start-up, and want to stall until about half-mile (about 3/4ths the time, and only if CEL was on) (indicative of a stuck solenoid, which didn't make sense especially after it was replaced brand new)
• Rear-Right of car made a click noise before CEL (about 1/2 the time)
• Low speed maneuvering felt like the automatic transmission was picking slightly different shifting times (was hard to understand what the difference was though, only occurred occasionally)

all in all I probably had the CEL come on about 9-11 times before I finally fixed the thing with the canister. The spill-test is a pretty good way to see for sure though, if it doesn't spill anything, it probably would be okay.

If you top-off when fueling up, this can quickly deteriorate the charcoal inside, leading it to dump powder or pellets into your evap system.

*edit* actually that's how it happened to me, I suspect my vapor vent valve was going bad, because I started with a bit of difficulties fueling up normally... and that likely made me to overfill the tank, as I then had to 'guess' when it was actually full vs. improperly shutting off. Probably the exact same thing has happened to you. The vent valve is the first step to fixing the problem, and the next step is likely fixing the damage caused by working around the vent valve's symptoms.

For what it's worth, I think my Evap Charcoal Canister was about $113 from the dealership.
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Old 04-17-2012, 02:58 PM   #4
Scooby Newbie
Member#: 111917
Join Date: Apr 2006
Location: Parsippany, NJ
2006 WRX Limited
Aspen White


The valve I replaced is separate from the charcoal canister, it's mounted above it with three lines running to it. When I had the charcoal canister out, I didn't shake it or anything. Also, no troubles starting the car after filling up.

CEL went away recently, and the I/M checks all passed so I took it to get inspected. It passed all the OBDII checks, but they failed me since they couldn't find my catalytic converter on my Cobb downpipe.
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