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Old 01-09-2009, 03:45 PM   #1
piercepcable
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Member#: 199670
Join Date: Jan 2009
Question 2002 Subaru Impreza Knock Sensor

Good Afternoon Everyone--

I recently went in for an oil change and was told that "both channels on my knock sensor had failed" and that it was in a passive, "fail-safe" mode.

To replace it, the technician mentioned it would be $99 for the new knock sensor and $200 for labor.

I picked up a Service Manual and found that it seems relatively simple to replace.... I am naive though.... is this a challenging replacement?

Here is a link to the knock sensor that I found @ $79 through Parts Geek.

http://www.google.com/gbproducts/...ek+Google+Base

Any Help would be great! Thanks much! I am new, so I hope that this was the correct forum to post this in.

~PC
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Old 01-09-2009, 04:13 PM   #2
Cocoa Beach Bum
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Is your CEL on?
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Old 01-09-2009, 04:18 PM   #3
suzuki4life
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Member#: 72706
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Location: PA,USA
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2002 RS 2.5
RBP

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Quote:
Originally Posted by piercepcable View Post
Good Afternoon Everyone--

I recently went in for an oil change and was told that "both channels on my knock sensor had failed" and that it was in a passive, "fail-safe" mode.

To replace it, the technician mentioned it would be $99 for the new knock sensor and $200 for labor.

I picked up a Service Manual and found that it seems relatively simple to replace.... I am naive though.... is this a challenging replacement?

Here is a link to the knock sensor that I found @ $79 through Parts Geek.

http://www.google.com/gbproducts/...ek+Google+Base

Any Help would be great! Thanks much! I am new, so I hope that this was the correct forum to post this in.

~PC
it takes maybe 5 minutes to change the sensor.

Its located just off the right side of the air box standing in front of the car.

You need a rachet, extension and a 10 or 12 mm socket

They say to torque it to spec. I went snug on mine (since spec torque is very low)

Crucial you put the new sensor in the SAME EXACT ORIENTATION AND POSITION as the one you are replacing.
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Old 01-09-2009, 04:19 PM   #4
suzuki4life
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Location: PA,USA
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2002 RS 2.5
RBP

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and replacement of the sensor on mine did not remove the CEL. I ended up replacing the front O2 sensor to kill the CEL.
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Old 01-09-2009, 04:31 PM   #5
fastenova
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Location: Tigard, OR
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Not your usual 1997
Legacy GT

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Yeah, don't let the oil change guys do it. What suzuki4life was saying about orientation - very true, but what is equally important as the orientation of the sensor itself is the path the pigtail/harness takes. Be 100% certain you run the pigtail along the same path as the original.

I'd torque it to spec, because if overtightened, after many heat cycles the plastic can crack, allowing moisture into the sensor and causing it to go out.

But, go get your codes pulled first (if you even have a check engine light). Does the car drive any differently than you're used to?
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Old 01-09-2009, 04:32 PM   #6
DiscoGsus
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I'd go with they are lying. Followed closely by "find a new shop."

I got my knock sensor from Rock Auto. Find you car, and the knock sensor will be under the "Emission" then "Ignition Knock Dectection Sensor."
I got the $47 dollar one and replaced it in about 5 mins.
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Old 01-09-2009, 04:40 PM   #7
piercepcable
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You guys/gals are great!!! Thanks for all the detailed info.... so fast too!

The CEL is on.... I bet I should pull the codes, eh? Sorry for being such a newb.

~PC
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Old 01-09-2009, 04:46 PM   #8
fastenova
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Location: Tigard, OR
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Not your usual 1997
Legacy GT

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Oh, and what the hell does "both channels" mean? There is only one wire going to the knock sensor on our car, it grounds on the block...
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Old 01-31-2009, 01:40 PM   #9
piercepcable
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Thanks for the feedback.

I am about to purchase the part. If you don't mind, I'd love to pick you brain one more time before doing so. When I hooked the computer up to the car the two faults I received were:

P0327 - Circuit Low Input
AND
P0328 - Circuit High Input

Are these indicative of a Knock Detector Failure, or might it be something else altogether?

Thanks,
~PC
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Old 02-04-2009, 09:04 PM   #10
gusto
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replace the KS. itll fix it. we see them alot.

12mm, extension, swivel, and ratchet. torque to spec (low tq so a 3/8 tq wrench will be handy) and orientate exactly like old one. its easy to do...main thing is make sure you do not cross thread the bolt going in since you will be at a weird angle initially.
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Old 02-04-2009, 10:03 PM   #11
yarrgh
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2001 2.5RS
Black Diamond Pearl

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^ what he said. and find a new shop.
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