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Old 07-29-2003, 10:20 PM   #1
Art Hazebrook
Scooby Newbie
 
Member#: 32825
Join Date: Feb 2003
Location: Atascadero, CA
Vehicle:
99 Impreza
white

Question PO325 Knock sensor circuit malfunction

Hi all, I'm a newbie w/ a 99 Impreza, 60k on the clock and a recurrent CEL=PO325.

1. Initially, the CEL would come on only under increased engine load (steep grades).

2. Changed plugs with OE NGK's. Discovered that the plugs hadn't been changed @ 30k.

3. Now the CEL (same code) comes on just driving down the street.

Are there any known problems w/ the knock sensor???

Thanks in advance
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Old 08-20-2007, 12:34 AM   #2
newshoes99
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Member#: 148454
Join Date: May 2007
Chapter/Region: MWSOC
Location: Milwaukee, WI
Vehicle:
2005 Legacy GT
Blue

Default cel knock engine for me

Altho I can't pinpoint exactly what I'm doing when it comes on I've got the same code.
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Old 08-20-2007, 12:50 AM   #3
Uncle Scotty
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OK Houston
we have an Uncle

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....known issue for the older NA's....bad knock sensors...replace them and be
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Old 08-20-2007, 01:15 AM   #4
newshoes99
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2005 Legacy GT
Blue

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Originally Posted by Uncle Scotty View Post
....known issue for the older NA's....bad knock sensors...replace them and be
If I replace it and it's not an issue anymore I'll be
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Old 08-20-2007, 09:46 AM   #5
munkis
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Chapter/Region: Tri-State
Location: brokenmotorsports.com
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Team Broken: V6 GF
rallyarmor.com

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make sure you when you do replace it you torque it to the proper spec are you can cause damage to the sensor and have the same problem all over again.
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Old 08-20-2007, 12:51 PM   #6
surowrxa
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Join Date: Dec 2005
Chapter/Region: MAIC
Location: Pittsburgh
Vehicle:
'12 Forester
'08 Legacy

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Quote:
Originally Posted by munkis View Post
make sure you when you do replace it you torque it to the proper spec are you can cause damage to the sensor and have the same problem all over again.
+1, I just replaced the knock sensor on my wife's Forester about 4000 miles ago. I lightly sanded the corrosion from the block with fine grit. I did not use a torque wrench, but the specs are like 12lbs., so I used a small socket wrench and tightened very little (snugly) after contact. No problems yet, CEL (also PO325) never returned. I figure to check it next oil change to see if it's loose.
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Old 08-20-2007, 05:27 PM   #7
newshoes99
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Location: Milwaukee, WI
Vehicle:
2005 Legacy GT
Blue

Default Why

Is there something wrong with the car that causes the sensor to go bad or is the sensor just not well made?
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