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Old 06-29-2011, 06:44 PM   #1
DAS97sport
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Default Knock Sensor DIY (2.2L EJ22)

I couldn't find a DIY for the knock sensor on here, so I thought I'd contribute.

So I bought my car a while ago and I took it in for emissions testing and I failed. I got fault code P0325: Knock Sensor 1 Circuit Bank 1 or Single Sensor. So I went to my local NAPA and picked up a new one for $87 plus tax. So here's what you'll need for the swap:



-New knock sensor
-Ratchet
-12mm socket w/ extension
-Flashlight (optional)

The knock sensor is tough to find if you don't know where it is. They put it in a real sh**ty spot. I took a few pictures to kind of lead into it. It is directly below the throttle body. Mine was hidden by some black tubing.
(I took the airbox off... it gave me a bit more room to work with)



Unplug the cord coming from the sensor at the white clip.


Now throw your 12mm socket on the extension, throw it on the wrench, and shove it down there.
Note: The extenstion i had was too long to fit under the throttle body, but too short to go on top. I threw another extension on there to make it longer. If you don't have one that is long enough to reach the bolt and allow you to put the wrench above the TB, I highly reccommend one. It's a pain trying from underneath.


Mine took a bit of work to get unstuck, but I finally got it.
Old sensor and bolt (notice the crack):


New sensor:


Put the bolt through the new one, stick it in the hole, and tighten it. I'm pretty sure it's supposed to be torqued to 16ft-lbs. When I was initially tightening it back down, it was in the hole but wouldn't grab (stripped). So I went to the hardware store and bought an 8mmX35mm bolt for 35 cents. Threw it in and worked great. I hope this thread is a help, and sorry if it's been posted already.

No more CEL


If I left anything out or if you have any questions, please let me know.
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Old 09-01-2011, 09:45 AM   #2
camflight
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Hi there,

I have a 2002 Impreza TS who need a new knock sensor, mine too is stripped... I was just wandering... for you it was the bolt that was striped ?

Mine is striped in the hole... so I suppoed I have to get an helicoil in there... but seem to be a pain in the butt tu put an helicoil there...

any suggestions ?

Martin
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Old 09-01-2011, 03:06 PM   #3
RaceFaceXC
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For the op and any others who will be doing this service, the clock angle of the sensor is important in addition to the torque. If you don't have a fsm to go by I would match it to the same angle as the one being removed.
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Old 09-07-2011, 09:15 PM   #4
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Quote:
Originally Posted by RaceFaceXC View Post
For the op and any others who will be doing this service, the clock angle of the sensor is important in addition to the torque. If you don't have a fsm to go by I would match it to the same angle as the one being removed.
I didn't know that the clock angle mattered when I replaced mine so I didn't note the original position. The code cleared and it's been about a month since I installed it, should I go back in and align it? If so, to what angle as I don't know what fsm stands for.
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Old 09-11-2011, 04:23 PM   #5
DAS97sport
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Quote:
Originally Posted by camflight
Hi there,

I have a 2002 Impreza TS who need a new knock sensor, mine too is stripped... I was just wandering... for you it was the bolt that was striped ?

Mine is striped in the hole... so I suppoed I have to get an helicoil in there... but seem to be a pain in the butt tu put an helicoil there...

any suggestions ?

Martin
With mine, I think part of the hole was stripped, so I just ran to the store and picked up a new bolt that was longer for like 49 cents.

Quote:
Originally Posted by CameronMac

I didn't know that the clock angle mattered when I replaced mine so I didn't note the original position. The code cleared and it's been about a month since I installed it, should I go back in and align it? If so, to what angle as I don't know what fsm stands for.
I also didn't know that mattered, and it's running fine with no codes. Don't know what fsm means either lol.
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Old 09-12-2011, 02:14 PM   #6
RaceFaceXC
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FSM = factory service manual

Of the engine is running well and there are no complaints by the ecu I wouldn't worry about adjusting the angle.
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Old 10-08-2011, 08:02 PM   #7
Sube-are-you
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My 1998 Subaru Impreza 2.5RS is running really rough and I've been reading everywhere that this seems to be the fix to get it back to normal. It has a check engine light on and has really rough acceleration as if it has a misfire. The check engine light threw codes for the knock sensor and the MAF sensor, and I already replaced the MAF sensor.

Does anyone know if this will fix the problem or if I could try anything else?

Any help is greatly appreciated!
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Old 10-10-2011, 12:40 AM   #8
biglittledog
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Thanks for posting this! Once you've done it, it's pretty easy but finding it the first time is tough without pictures like yours.
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Old 10-19-2011, 12:44 AM   #9
DAS97sport
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Quote:
Originally Posted by Sube-are-you
My 1998 Subaru Impreza 2.5RS is running really rough and I've been reading everywhere that this seems to be the fix to get it back to normal. It has a check engine light on and has really rough acceleration as if it has a misfire. The check engine light threw codes for the knock sensor and the MAF sensor, and I already replaced the MAF sensor.

Does anyone know if this will fix the problem or if I could try anything else?

Any help is greatly appreciated!
If its throwing a code for a knock sensor, replace it. Even if its not the problem, it'll be out of the way.
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Old 02-24-2012, 04:14 AM   #10
jinius
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did this today, great write up, and thanx!
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Old 05-27-2012, 01:44 PM   #11
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Good write up.

Got a bank 1 knock sensor code today.

Its this one right? Under the throttle? I have an '01 Impreza 2.2L.


The sensor itself is the black circle-shaped part, with the bolt through the middle, right? The white clip you are talking about is the one at the bottom of my picture? Seems like a pretty straightforward replacement.
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Old 05-27-2012, 02:01 PM   #12
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Quote:
Originally Posted by ManualOverAuto View Post
Good write up.

Got a bank 1 knock sensor code today.

Its this one right? Under the throttle? I have an '01 Impreza 2.2L.


The sensor itself is the black circle-shaped part, with the bolt through the middle, right? The white clip you are talking about is the one at the bottom of my picture? Seems like a pretty straightforward replacement.

yeah man, that's the one. it is pretty simple. as the OP stated, remove the airbox to give easier access to the knock sensor.
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Old 05-27-2012, 02:13 PM   #13
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Awesome. I might not even need to remove the airbox but I'll see.

I'm hoping this fixes the code and it's not a wiring thing.

Edit: and should I go to a dealer to get the oem sensor, or would it be fine to just go to napa?

Last edited by ManualOverAuto; 05-27-2012 at 02:20 PM.
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Old 05-28-2012, 12:56 PM   #14
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...so, should i get the part from a dealership, or a nearby napa?

I know some parts are better left OEM but others it won't matter, and im just not sure about this knock sensor. Trying to do this today or tomorrow, so let me know which I should buy.
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Old 05-29-2012, 07:44 PM   #15
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Sorry to keep bumping this thread with the same question.

Which of these is the correct one? I know they would all work, but I also have read that some white connectors are different, on different ones, thus not fitting.
http://www.rockauto.com/catalog/x,ca...,parttype,5108

Both napa, and the dealership wanted $120+ for the sensor. Rockauto is cheaper so I just wanted to make sure I order the right part.
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Old 05-30-2012, 12:02 AM   #16
DAS97sport
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Quote:
Originally Posted by ManualOverAuto
Sorry to keep bumping this thread with the same question.

Which of these is the correct one? I know they would all work, but I also have read that some white connectors are different, on different ones, thus not fitting.
http://www.rockauto.com/catalog/x,ca...,parttype,5108

Both napa, and the dealership wanted $120+ for the sensor. Rockauto is cheaper so I just wanted to make sure I order the right part.
Sorry dude, I didn't see this! I got mine at napa for $90 or so, but if you don't mind having a cheap product you can find them on eBay for like $15 until you get money to buy a good one. I'm on my phone and that link won't load, let me get on a computer and look at that.

Edit: those all look like they will work.
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Old 05-30-2012, 12:36 AM   #17
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Quote:
Originally Posted by DAS97sport

Sorry dude, I didn't see this! I got mine at napa for $90 or so, but if you don't mind having a cheap product you can find them on eBay for like $15 until you get money to buy a good one. I'm on my phone and that link won't load, let me get on a computer and look at that.

Edit: those all look like they will work.
Yea I didn't want to go to eBay. I've heard rockauto has cheap parts that are pretty good or oem, so I though I'd try them. The dealership said $130, and napa was like $15 less or something.

Do you know who actually makes the oem ones?

Thanks for the help.
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Old 06-01-2012, 01:15 PM   #18
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Well it was definitely cracked. Hard to see in the picture.



Now to find a torque wrench to finish it up.......
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Old 06-01-2012, 11:08 PM   #19
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I would add four things to this walkthrough -

Install the new sensor in the same orientation as the original
Use a swivel and a 6 sided socket when removing the sensor
Sand the mating surfaces. This means the block and the bottom of the sensor
DO NOT CROSS THREAD THE BOLT. Meaning get the threads started before you attach the ratchet. I've seen so many Subarus with this hole all mangled. Luckily there are extra threads in the block and you can replace the original bolt with one that is about a 1/3 inch longer if it gets really bad.
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Old 06-02-2012, 01:54 AM   #20
Dr. Octawakaoctapus
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Cleaning the surface is for sure a good idea, I've never went as far a sanding it but carb clean and a rag work good too.
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Old 06-02-2012, 11:37 PM   #21
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My 08 impreza 2.5i knocks at low rpms like if im rolling through a stop sign and i go from N to 2nd it knocks often. Ive been doing some reading and i read that this is common at low rpms. Is it bad though? like will it damage anything? Before i read through i always assumed that a knock ment that i was totally effed and needed to do a major repair. I dont want to call a dealership and ask a question because they will probably tell me i need an engine swap and all this other bull when i really only needed an oil change. not very trusting with dealerships. any feedback is welcome.
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Old 06-04-2012, 09:11 PM   #22
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bumpp
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Old 06-04-2012, 10:00 PM   #23
ManualOverAuto
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Quote:
Originally Posted by JDMBlake
bumpp
I think you might be confusing rod knock and the knock this thread is talking about.

Rod knock, yea that's BAD.

This thread is talking about detonation, which is another name for a knock. That's why when ordering a new knock sensor, the part description will say "Knock (detonation) sensor".

Both aren't good, but I think I'd rather have detonation (knock), than rod knock.
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Old 06-04-2012, 10:13 PM   #24
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Now that i think of it, i probably am mixing the two. the detonation knock happens often. ive watched youtube vids of the rod knock i think and its nothing like that. I wish it was, id take the money and buy a WRX. haha
*regretfully knocks on wood
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Old 06-04-2012, 10:26 PM   #25
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Quote:
Originally Posted by JDMBlake
Now that i think of it, i probably am mixing the two. the detonation knock happens often. ive watched youtube vids of the rod knock i think and its nothing like that. I wish it was, id take the money and buy a WRX. haha
*regretfully knocks on wood
Haha.

Yea so I guess you could replace the sensor and see if that helps. If not, I'm not too sure what else you could try. Did you get a CEL for the sensor?

What octane gas do you use?

I believe, the higher the octane, the higher the resistance to detonation. So maybe running premium could help.

Then again idk. Hopefully someone else will chime in.
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