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Dead91silvia
11-20-2011, 12:15 PM
Difficulty level: 1-EASY

Hope this hasent been posted before... Figured this would be good for the rookies! This is a super easy part to change, no need to go to the dealer or a shop! I must be stupid, I'm a shop owner! haha

So I kept getting a CEL for my knock sensor in my BH 2000 GT 5 speed wagon with a SOHC EJ25. I finally just broke down and went to Subaru and picked one up (It's nice when you own a mechanic shop and get wholesale). In hig population areas of WA, your car will not pass smog with CEL's and also its a good thing to make sure your car is running right anyway.

Typical retail cost should be about $100...

Tools needed:
-12mm socket
-ratchet
-long extension (8-12")
-pic tool (makes life easy for the unplugging, but not necessary)

1: Open your hood! :grin:
https://sl-i.net/FORUM/images/imported/2011/11/IMG_7831-1.jpg

2: Locate the sensor...
It's located right under the throttle body on the driver side (left side) on the top of the engine block. It's not to far from the transmission.
https://sl-i.net/FORUM/images/imported/2011/11/IMG_7836-1.jpg

3: Remove 12mm bolt
The sensor has a 12mm head bolt, holding it to the motor. I used a 3/8's socket with a wobbly extension to get down there.
https://sl-i.net/FORUM/images/imported/2011/11/IMG_7837-1.jpg

4: Unplug and remove
Not hard at all! You will have a white clip holding the sensor plug together. It will have a pin, just push it down and pull. Dont get frustrated if it doesn't pull out easy. If it's hard to remove, knock it around a bit as it might have some dirt stuck in it...
https://sl-i.net/FORUM/images/imported/2011/11/IMG_7838-1.jpg

5: Installation!
Now your ready to install the new one! Goes in just how the old one comes out.
-plug it in
-line up the bolt (pre thread, DO NOT run it in unless it goes in nice).
https://sl-i.net/FORUM/images/imported/2011/11/IMG_7839-1.jpg

6: Last thing to do is clear your CEL and your done! :smt023
Sorry no pic of that...

If you dont have a scan tool, most of the parts stores have one and can clear your code for you or talk to a mechanic friend if you have one, I'm sure they wouldn't mind clearing a code for you.
Wiscon_Mark
11-20-2011, 12:54 PM
:smt023

Thanks! I never knew how to do this - that's pretty easy.
Garrison
11-20-2011, 03:30 PM
If you don't have access to a code reader, or don't want to drive to a shop, simply unplugging your battery for ~ 30 seconds and stepping on the brake pedal will reset the ecu.

Nice write-up.
Matty2Hotty
11-20-2011, 05:17 PM
Older legacies 99 and older stay away from Autozone knock sensors, their sensor plug only works with the BE/BH models unless you pull the plug pin out of your old sensor and reuse the plug on the new sensor. Other than that the sensors are the same.
Wiscon_Mark
11-21-2011, 08:03 AM
I'd always recommend going OEM for these kinds of things.
TGX4776
11-21-2011, 08:22 AM
Older legacies 99 and older stay away from Autozone knock sensors, their sensor plug only works with the BE/BH models unless you pull the plug pin out of your old sensor and reuse the plug on the new sensor. Other than that the sensors are the same.


they probably gave you the wrong part. mine went in no problem. Bought it over a year ago
Dead91silvia
11-21-2011, 11:36 AM
If you don't have access to a code reader, or don't want to drive to a shop, simply unplugging your battery for ~ 30 seconds and stepping on the brake pedal will reset the ecu.

Nice write-up.

This can also work...


Older legacies 99 and older stay away from Autozone knock sensors, their sensor plug only works with the BE/BH models unless you pull the plug pin out of your old sensor and reuse the plug on the new sensor. Other than that the sensors are the same.

Thats what happens with aftermarket parts sometimes.



Older legacies 99 and older stay away from Autozone knock sensors, their sensor plug only works with the BE/BH models unless you pull the plug pin out of your old sensor and reuse the plug on the new sensor. Other than that the sensors are the same.


they probably gave you the wrong part. mine went in no problem. Bought it over a year ago

I got my sensor at Subaru, but it was a trial aftermarket sensor. They had it pined wrong, but only took me a few minutes to re-pin it. I got it for half the price of the OEM one, but this only because I have a good rep with my parts guy :smt023