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Old 05-09-2012, 06:05 PM   #1
corygoose
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Member#: 319642
Join Date: May 2012
Default 1999 Subaru Legacy Error codes

I have a 99 Subaru Legacy GT 30th anniversary edition. I was first getting an egr error code. I think it was p0400. Replaced the egr vacuum solenoid, thought it fixed the problem, then it came back on, but this time it was a different error code. It was p0325 a knock sensor error code. Just replaced the knock sensor. The check engine light was off for about a week, and it now just came back on. Not sure what the new code is, but I bet its one of the 2.

Are these 2 problems related? It seems like a common problem with subarus?

Someone told me that there is a tube that connects to the EGR valve that gets blocked up-take it off and clean it out? Would that fix it? Do I need to clean anything else?

What do you guys think?
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Old 05-30-2012, 10:28 PM   #2
pcxrs
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Join Date: Dec 2005
Chapter/Region: W. Canada
Location: Edmonton
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1998 Impreza Outback
Green

Default

I'm in the same boat, knock sensor code... bought a new knock sensor, holding off on installing it until I read up and check things out. I need more info about checking resistance/wiring. I read somewhere else that it may be a PCV valve that lets too much oil vapour in and lowers the octane causing the knocking.

Anyone?
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Old 08-10-2012, 07:23 AM   #3
bluebomber06
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Join Date: Apr 2008
Chapter/Region: MAIC
Location: Hamburg Pa
Vehicle:
2009 Legacy 2.5i
Urban Gray Metallic

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dude! i have the excat same problem and did the same repairs lol. ill update on this to let you know my repairs and how i performed them. i plan on working on it throughout this weekend.

also i see this thread is a little on the older side. so if you have already performed som repairs let me know.
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Old 08-10-2012, 09:58 PM   #4
bluebomber06
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Join Date: Apr 2008
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Location: Hamburg Pa
Vehicle:
2009 Legacy 2.5i
Urban Gray Metallic

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ok, so this evening i replaced all the vacuum lines that had anything to do with the EGR valve. Two going to the throttle body. Two going to the vacuum solenoid. One vacuum line on the top of the EGR. Two going under the solenoid. Last two mentioned is the same line just seperated by a metal line, be sure to clean that metal line out when removing the EGR and rubber lines.

To remove the EGR, I found it was very easy after un bolting the air resonator that attaches to the throttle body. Just swing it out of the way, you dont have to remove it.

Now for the EGR. Its two 12mm bolts that hold it on the manifold. Once removed (or while on the car but might be harder to see) use new vacuum line, attach it to the nipple on the EGR and suck. You should see the diaphram move in and out, if it does not still try and clean it and see if it helps. But if it does not the diaphram could be faulty and replacement of the valve at this point would neccesary.

Now to clean it. The areas your going to want to clean will all be black and carboned up. Just spray on a little throttle body cleaner and scrub with a wire brush.Then fill the internals with it and let it soak for a little bit. 10 minutes should be long enough to remove some grim. Repeat as needed. Also take a flat head screwdriver and scrap out the EGR port. When scraping, scrap from the inside out!!!! You dont want to push that carbon back in the manifold.

Tomorrow saturday 8/11/12 I will driving the vehicle for about 3 hours round trip. I did NOT remove the Neg battery cable to clear my check engine light. I want to see if the trip will make my monitors count properly and clear itself. Im taking my buddy to go pick up a 93 FD!!!!!

I will keep you posted either saturday night or sunday if the vehicle clears itself. Lets get those fingers crossed. If you need more clarification, just hit me up.
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Old 08-18-2012, 03:47 PM   #5
bluebomber06
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Location: Hamburg Pa
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2009 Legacy 2.5i
Urban Gray Metallic

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the light did not clear itself on the long drive. removed the large EGR tube and cleaned it as well as the tube that runs to the bottom of the BPT valve. ordered new EGR valve and gasket. will be installing today. i will keep this thread updated.
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