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Old 02-01-2017, 08:32 PM   #1
b.rock.1989
Scooby Newbie
 
Member#: 202187
Join Date: Feb 2009
Chapter/Region: E. Canada
Location: kitchener ontario canada
Vehicle:
2008 Forester XT
WRB

Default '08 Fxt - P0459

I've searched and so far I cannot seem to get a definitive answer, so here goes...

2008 Forester XT Sport - 230,000 kms (~143,000 miles)
Catless Downpipe to stock exhaust
Short Ram Intake
stock TD05 turbo
Stage 2 Pro Tune with COBB AP V3

I live in Ontario, Canada and we need emissions tests where I'm from.

one night i got a few codes:
P0442, P0458 and P0459

exact code description:
P0459 - Evaporative Emissions System Purge Control Valve Circuit High

the P0458 AND P0459 sort of confused me so i cleared ECM and now i consistently get P0459. I just replaced the whole PCV valve assembly and the TOP purge control solenoid (genuine subaru parts). I've never really had to deal with emissions stuff too much because they have all seemed to just work up until now. i was told by my tuner to check the leads coming out of the charcoal canister at the back for a junction that typically corrodes and shorts but i stripped back about 12-13 inches of loom and tape and saw no junction. turning the car on and off while measuring the leads i get voltage (from what i remember 12v? i probably should have wrote it down) and i can't find any short in any of the wires back there.

at this point i am out of ideas. i thought i just replaced the purge control valve but obviously i was wrong.

i would love to attach a picture but for some reason i am not allowed!!
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Last edited by b.rock.1989; 02-01-2017 at 08:35 PM. Reason: type-O
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Old 02-01-2017, 10:15 PM   #2
hondaeater69
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Member#: 60324
Join Date: Apr 2004
Location: soon to be somewhere else
Vehicle:
1998 RS

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did you replace the purge valve that sits by the alternator, or the one back by the canister? i believe the code you have is for the valve located in the engine bay by the alternator.
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Old 02-02-2017, 06:01 PM   #3
b.rock.1989
Scooby Newbie
 
Member#: 202187
Join Date: Feb 2009
Chapter/Region: E. Canada
Location: kitchener ontario canada
Vehicle:
2008 Forester XT
WRB

Default

I replaced the one that sits behind the alternator. However, there are two purge valves there. both purge valves look identical but are in fact different. They both have two hose connections. The bottom connection on both of them come from the same hose from a little "T" splitter.

The TOP hose on the TOP purge valve goes to the intake just before the turbo.
The TOP hose on the BOTTOM purge valve goes directly in the intake manifold right after the throttle body.

I'm not even certain those are the purge control valves? Could those be something else? A solenoid maybe? or am I just getting my terms mixed up?
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Old 02-05-2017, 05:14 PM   #4
b.rock.1989
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Member#: 202187
Join Date: Feb 2009
Chapter/Region: E. Canada
Location: kitchener ontario canada
Vehicle:
2008 Forester XT
WRB

Default

anyone?
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