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Old 05-24-2004, 01:24 AM   #1
X4 SRT
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Member#: 40636
Join Date: Jul 2003
Location: Las Vegas
Vehicle:
2001 2.5 RS Coupe
Silver

Default P0328 CEL code

So with in the past few weeks I've been to the subaru dealer twice and had both my front and rear 02 sensors replaced. As I was leaving the dealer the second time my CEL came on again two blocks from the dealer. I went back right away, but the service department had already closed. So anyways I'm mad because I want to know what the hell hte CEL is on for again. So i'm going to go back the next day, but low and behold the CEL had turned off, so i didn't go back. To make a long story short...The CEL has been going on and off for two weeks. I had it scanned and it's throwing a P0328 Knock sensor circuit high input. What the hell does this mean???I thought that using underrated octane in your car would cause it to knock, but I'm using 88 in my 2.5RS. So I decided to see if using 91 would fix the problem and it didn't. Does anyone know why my car is throwing this code and how I might fix it? If i can't figure it out in the next few days I'm going back to subaru for a third time for my CEL, and this is really starting to piss me off. By the way the car is a 2001 2.5RS with 45K on it. The only mod is a Cobb CAI. Please Help me.
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Old 05-25-2004, 08:40 AM   #2
ironsteel
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Join Date: Jun 2001
Location: MA, USA
Vehicle:
2001 Legacy GT

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I too am having the same issue with our 2001 Legacy GT. It has been on and off for several weeks and then it is not consistently on. I went to AutoZone (local here in MA) for a free CEL diagnostic. I guess the knock sensor needs replacement. Dealer quoted $295. No thanks. The part is only $80 from the local store but it's a Wells brand. I think ppl recommended to use Bosch. I need to find out where I can purchase a Bosch knock sensor at a cheaper price online for a 2001 Legacy 2.5 SOHC motor. I think it's the same as your 2.5RS. I've searched many places online and all I find is the knock sensor for the 2.5L DOHC motor.

I heard it's easy to change too. I took a look under the hood last night. It's either a plug/socket thing right under the TB or the one further in located below the air filter box. Not sure which one. WOuld be nice if someone could scan a pic from the factory repair manual and post it here.

Thx.
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Old 05-25-2004, 12:04 PM   #3
rick-l
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Join Date: Mar 2003
Location: Chesterfield, MO
Vehicle:
2003 wrx
srp

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Bored so I looked at the 2003 WRX manual.

To trouble shoot this cel they say to disconect the ECM and measure > 400k ohms to chassis between the wire to the sensor and chassis ground. Then hook it back up and turn the ignition on and measure > 2 volts on that wire.

if you get these two it is supposed to be good. It says clear the codes and try again.

This may or may not help you


Edit: changed to should be less than 400 k ohms

Edit again: The bottom line is the sensor should measure between 400k and 700k ohms.

Last edited by rick-l; 05-25-2004 at 01:41 PM.
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Old 05-31-2004, 09:06 PM   #4
jotarou1
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Join Date: Dec 2000
Location: Sacramento, CA, USA
Default I got mine from the dealer!

I have a 2001 Impreza 2.5RS and I got the knock sensor from the dealer for 85 dollars. I also had P0328 CEL. It went away after I changed the knock sensor, but after 1000 miles it came back. It came back on while I was on a trip up over the rockies (9,000 feet) and when I got back down to 5,000 feet it went away again. I have driven another 600 miles since it went off and went over the sierras (7500 feet) without it coming back on. I have to go back to autozone to erase the code since I believe it stays in the ECU for a while after, but it currently is not lit.

I changed it myself and it took approximately 30-45 minutes to do. Very easy. I can take some pics if you want me to show you what you replace.

Juan
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Old 06-23-2004, 11:57 AM   #5
XXL
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Default Re: I got mine from the dealer!

Quote:
Originally posted by jotarou1
I changed it myself and it took approximately 30-45 minutes to do. Very easy. I can take some pics if you want me to show you what you replace.

Juan
Pics of the module would be greatly appreciated. I too have the problem ironsteel is having and would like to know what I'm looking for under hte hood.
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Old 06-24-2004, 07:30 PM   #6
jotarou1
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Join Date: Dec 2000
Location: Sacramento, CA, USA
Thumbs up I will get those pics ASAP.

I don't have a digital camera with me, but I will borrow one over the weekend. I should be able to post a pic by Monday. If you want to try to find it, do the following.

If you are looking under your hood from the front of the car, find the throttle body.
To the right about 4 inches, between the gas cable, cruise control cable, you will see the knock sensor below them.

I will post pic as soon as possible.

Juan

EDIT: Forgot to add. The new CEL that I got after replacing the knock sensor was for a different problem. I erased both codes after returning from my trip, and they haven't come back on since. List price for OEM knock sensor was 85, but you should be able to find it for less from a place like Subaru Gwinnett (talk to Lisa).
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Old 06-24-2004, 08:55 PM   #7
XXL
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Default Re: I will get those pics ASAP.

Quote:
Originally posted by jotarou1
I will post pic as soon as possible.
¡Gracias! I'll look around and see if I can find it... and keep my eye out for your pictures to confirm.
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Old 07-04-2004, 04:38 PM   #8
XXL
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Default

So am I looking at the right thing here???





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Old 07-04-2004, 04:43 PM   #9
Uncle Scotty
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OK Houston
we have an Uncle

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Quote:
Originally posted by XXL
So am I looking at the right thing here???






Yep....
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Old 07-04-2004, 10:34 PM   #10
RyansJDMgc8
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Member#: 65462
Join Date: Jul 2004
Location: Riverside CA USA
Vehicle:
01' 2.5RS
Silver/Carbon Fiber

Default

Yeah thats the knock sensor. I also have a 2001 RS and am haveing the exact same problem. The only thing is that last weekend I changed my knock sensor and front o2 sensor but I am still getting a po328 CEL. I dont know what is going on. I guess the lean/rich air/fuel mixtures could make the knock sensor throw a code? My air/fuel ratio gauge is noting that my motor is running rich. Maybe ecu has to get used to the new o2 sensor?
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Old 07-04-2004, 10:46 PM   #11
Uncle Scotty
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we have an Uncle

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Too lean can cause knock...

Check all grounds and the pos. on the alternator. and the battery terminals.
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Old 07-05-2004, 01:17 AM   #12
RyansJDMgc8
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Member#: 65462
Join Date: Jul 2004
Location: Riverside CA USA
Vehicle:
01' 2.5RS
Silver/Carbon Fiber

Default

All seems fine. My motor is not running lean at all. It is running too rich. My battery cables look as new and my alternator as well. Im stumpt!.......
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Old 08-09-2005, 10:04 AM   #13
krebstar
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Join Date: Nov 2003
Location: Tampa, FL
Vehicle:
2001 '01 Impreza 2.5
Silverthorn

Unhappy I just got a PO328

I'm pretty sure it's my fault. Yesterday, I was cornering too hard on low fuel. I starved the engine. After I filled the tank w/ gas, I noticed the CEL. I got it checked at Autozone this morning. The light is currently off. Hopefully, it'll stay off.
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