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Old 07-06-2006, 07:56 PM   #1
ratso
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Default '97 Legacy GT 2.5 Knock sensor

Getting P0325 code on my 97 Legacy. Scanner says "Knock sensor malfunction bank 1 or single sensor"
1) where is my knock sensor?
2) is there morethan 1 on this motor??

Thanks!

Jim
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Old 07-06-2006, 09:28 PM   #2
Patrick Olsen
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Just one knock sensor, it's on the top of the engine block pretty much straight down below the throttle body. It's a little offset towards the driver side, so if you look down below where the throttle cable(s) attach to the TB you'll see the knock sensor. Round black guy held in place by a single bolt with a 12mm head on it.
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Old 07-06-2006, 09:52 PM   #3
ratso
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Thanks,
Found it right where you said it would be.
Looked fine, no broken wire, good connecter...No short from base to wire. In fact it measured 1.2M-ohm. Don't know if that is good or not. Guess I should just replace it?? Darn little thing is like $85 from Autozone!
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Old 07-06-2006, 11:22 PM   #4
Subie Gal
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cheaper to get one OEM ... than from auto zone

Jamie
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Old 07-07-2006, 05:33 PM   #5
ratso
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Called the dealer today,....$116 and not in stock.
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Old 07-07-2006, 05:36 PM   #6
EJ1
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Really? We stock a ton of those.
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Old 07-07-2006, 05:57 PM   #7
Patrick Olsen
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Quote:
Originally Posted by ratso
In fact it measured 1.2M-ohm. Don't know if that is good or not.
Mine measured about 1/2 that. I am currently running a dummy resistor in place of the knock sensor - about 560kohm and no CEL for a couple weeks now. I would say that high resistance is what triggered the CEL.

Pat
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Old 09-26-2006, 03:26 PM   #8
PleiadesNight
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Have been having hesitation problems and CEL going on and off for a while now. Figured it was the knock sensor but have had no money to replace it. Have had misfire codes on all 4 cylinders, but at different times (first 3 and 4, then 1, then 2). Have had knock sensor code read 3 times. Yesterday the car was completely uncooperative; bucking, sluggish, and the flashing CEL. I know that I can't put off fixing it any longer.

Codes were cylinder 2 misfire and PO325 "Knock Sensor 1. Circuit Malfunction. Bank 1 of 1 Sensor." The circuit part throws me off. If I have the knock sensor replaced, is it possible that my problem wont be fixed because of a wiring issue?

Basically, I'm concerned because I'm away at college on my own, no job, no garage... My ex-boyfriend has my tools, I have no multimeter, etc. I'm afraid to have the Subbie dealer do the knock sensor and not have the problem resolved.

Thanks for your help.

EDIT: Called the Subaru dealership. Quoted me for $81.73 for labor and $101.85 for sensor. When I went in a few weeks ago to have the code checked they told me about $70 for the sensor and $100 total to have installed. I can't possibly afford to have them do it.

There is a $65 knock sensor at O'Reilly's. My problem is the draining of the coolant system. If I find a location to do it myself (like a family member's garage), does it have to be completely drained? Any pointers on how to do this job with my limited circumstances? Do I have to remove the intake manifold to replace the ks? Thanks.

Last edited by PleiadesNight; 09-26-2006 at 04:19 PM.
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Old 09-26-2006, 08:27 PM   #9
Patrick Olsen
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Quote:
Originally Posted by PleiadesNight View Post
There is a $65 knock sensor at O'Reilly's. My problem is the draining of the coolant system. If I find a location to do it myself (like a family member's garage), does it have to be completely drained? Any pointers on how to do this job with my limited circumstances? Do I have to remove the intake manifold to replace the ks? Thanks.
You don't need to remove anything or drain any coolant. You'll need a 12mm socket and a long extension to reach down under the throttle body (on the side where the throttle cables attach). It's a pain in the ass to get to, but you don't need to remove anything to get to it, and there's certainly no reason to pay the dealer $80 to do a 5min job. (Yet another reason to hate (some) dealers - an $81 labor charge for a job that would take a monkey 10min at the absolute most to complete.)

FWIW, I've been running my dummy resistor in place of the knock sensor for nearly 3 months now. The car runs great, makes better mid-range power than it did before, and seems perfectly happy without the knock sensor.

Pat
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