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Old 12-17-2008, 06:56 PM   #1
gtbensley
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Default Knock Sensor? What should I do?

After the ice storm we just had I went and started my car and it threw a check engine light. Started driving and was not running very well so I stopped and shut it off. Started the car again a couple minutes later and it ran fine but the code was still there. I pulled the codes and they were for cyclinder one and two missfire and a malfunction with the knock sensor. What should I do? Where should I start? Replace the sensor? Thanks for the help
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Old 12-17-2008, 09:42 PM   #2
Kooter2.5
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If you clear the codes do they come right back? If the Knock sensor comes back on and misfires don't replace the sensor. Either way replacing the sensor wouln't be a bad start, torque it to the correct specs. Is the car still having drivablity problems?
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Old 12-17-2008, 09:49 PM   #3
gtbensley
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The code has not come back, I have probably driven over 200 miles since I cleared it, the car drives just fine, no problems what so ever. Where is the sensor located on the engine? It only has one correct?
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Old 12-17-2008, 10:02 PM   #4
bl_easy
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OBD2 makes some problems SUPER easy to fix. It's like the answer key, dude.

If the car starts running like crap and the OBD2 says is because of a knock sensor, then what do you do? Change the knock sensor...
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Old 12-17-2008, 10:13 PM   #5
Kooter2.5
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When looking down on the motor it is on your righthand side(Left bank of the motor) bolted onto the block kind of under the rear intake runner. It's a very basic device, to bad they still cost almost a Bill!

If the code has not returned, then I wouldn't sweat it til it comes back on. Which code was it for the KS?
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Old 12-21-2008, 01:51 PM   #6
fornetti14
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Knock Sensor is an easy fix. I think mine was $80 at Autozone - one 12mm bolt holds it on and it's right on top near the drivers side.

Last edited by fornetti14; 01-05-2009 at 08:37 PM. Reason: Yep, it's a 12mm (originally thought it was 10mm)
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Old 01-05-2009, 07:05 PM   #7
supernick77
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Default 12mm

its a 12mm
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Old 01-05-2009, 08:15 PM   #8
watchunglava
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if you ever need a hand im just up the road
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Old 01-05-2009, 10:53 PM   #9
suzuki4life
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give it some time.

if the knock sensor is activated from bad conditions (in an excessive way) you can get false readings.

You could very easily got water in your fuel, in the intake stream somewhere or the ecu is just glitching.

Knock sensors aren't cheap (close to $100) so I would avoid replacing it unless there are no other options.
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Old 01-27-2009, 05:05 PM   #10
generalee69
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sorry to bump an oldish thread -- Is there any tips/secrets/cautions to installing a knock sensor? I read through the online service manual. It just said torque down to XX ft/lbs and make sure the wiring is pointing in the right direction.
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Old 01-27-2009, 06:54 PM   #11
bape-ape
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Thats it, Super easy.
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Old 01-27-2009, 06:56 PM   #12
generalee69
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Quote:
Originally Posted by bape-ape View Post
Thats it, Super easy.
Alright cool, thanks. It is just a mini-load cell isn't it? I wasn't sure if it needed any sort of special handling.

Thanks again.
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Old 05-05-2009, 04:07 PM   #13
MilkManX
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Is it easy on a 98 Impreza L ?

Thanks!
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Old 05-05-2009, 07:30 PM   #14
fornetti14
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Yes, it's super easy. One bolt and a wire connector and you're done. It's sitting right on top of the motor towards the drivers side.
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Old 05-06-2009, 09:14 PM   #15
MilkManX
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Impreza GC8

Thanks everyone. I got the part today and will be putting it in very shortly here.


Its all fixed now!

You guys rock!




Last edited by MilkManX; 05-07-2009 at 02:51 PM.
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