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2006 WRX wagon 5MT
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77 Posts
Discussion Starter #1
So a couple weeks ago my '13 Forester cel came on (with of course the traction control and flashing cruise lights). Mind you the car only has about 4k on the clock. Took it to autozone to have codes read and it was a P0451, which is an evaporative emission control code ie go tighten gas cap. Tightened cap and light went off, couple days later light came back on. The light was making me crazy as I know I tightened the cap and it would come on and off every other day! :catfight:

Finally had time and took it to the dealer to have them check it out. They diagnosed the problem and it was one they had yet to see so I figure I would share with the forum!

This is the service record:

"Downloaded codes and retrieved diagnostic trouble code: traced fault and found the following: p0451 evaporative emission control system pressure sensor performance. Found is engine harness black/green splice from 1 wire to 4 black/green wire. Poor connection at crimp. When engine starts and moves the engine harness the poor contact is created. soldered the crimp in engine harness. Re taped and cleared code."

Hope this helps someone in the future from losing the mind like me :icon_redface:
 

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12 Premium 5-speed
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4,733 Posts
Intermittent problems can be a bear to find, so kudos to the dealer.
 

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2009 Forester
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1 Posts
Great but that isn't going to be the problem with my lights - ABS and Traction. It could be anywhere in any wiring harness or somewhere else.
 

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2012 Forester XT Touring Auto
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759 Posts
@joe_pinrhill I lucked out. Both solenoids are are like $150+, it was a used FXT that I bought from a dealer and did all the work for free since the trouble was right as I left the place. Took them a very long time to diagnose, think the shop is a bit green, but once they went down the list of possible causes (that werent expensive parts) they did the work.
 

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2012 Forester2.5X Premium Auto
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36 Posts
I've been getting the P0451 trouble code off & on for over a month on my 2012 Forester and it usually went away when I tightened the gas cap, but kept coming back.
For $12 I replaced the gas cap with an aftermarket Stant # 10838 cap and the code went away. Guess I got lucky.
 

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2012 Forester2.5X Premium Auto
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36 Posts
UPDATE: I spoke too soon... the P0451 trouble code is back. Does anyone have a picture of the wiring fault area, or a wiring diagram?
 

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2012 Forester2.5X Premium Auto
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36 Posts
I think it might be a "valve pressure controler" Part Number: 42084AE130. Does anyone know where this part is located and how to get to it?
Any help would be greatly appreciated!
 

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2009 Legacy
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910 Posts
I think it is number 56 on this drawing. In the manual, they call it a "Leak Check Valve Assembly", tho. For reference, #58 is the charcoal canister so it likely is near the tank.

531732
531733


Here's a blowup. It doesn't quite look like the part number you have there. It seems to consists of a pump, valve and sensor in the wiring diagram.
 

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2012 Forester2.5X Premium Auto
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36 Posts
Great diagrams thanks!! I took a guess on the part # so yours is probably more accurate.
It looks like the part is located under the rear hatch cover, behind the back of the rear seat. Does that sound right?
Thanks again for your help!
 

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2009 Legacy
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910 Posts
I think that's where it is. Some of these parts are on top of the tank, just out of reach, which totally blows chunks because they are hard to get.
You're welcome.
 

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2012 Forester2.5X Premium Auto
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36 Posts
I removed the rear hatch floor cover, foam, and metal shields that covers the charcoal canister, hoses, and valve. Attached is what I see behind the rear seat on the driver side. It's the only electrical component back there. I can't figure out how to disconnect the gas line hoses. It looks like I need a custom pressure clip/push tool...
 

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2009 Legacy
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910 Posts
I think harbor freight sells that tool. It is a set. It looks like a cylinder cut length wise so there are two halfs that are attached to a scissor looking contraption.
Can't remember what those things are called but will keep looking for the name/link.

Edit: this tool may be what you need. They have a cheaper set too, I think.
 

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2012 Forester2.5X Premium Auto
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36 Posts
P.S. I plugged and unplugged the connector to see if it would help. It did not. Ignore the dog hair our retriever sheds a lot. 😉
 
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