View Poll Results: What parts did you replace for your knock sensor code?
I replaced only the harness and it fixed the issue. 3 27.27%
I replaced only the harness and it fixed the issue.
3 27.27%
I replaced only the harness and it did not fix the issue, CEL was still on. 1 9.09%
I replaced only the harness and it did not fix the issue, CEL was still on.
1 9.09%
I replaced only the harness and the affected sensor. 0 0%
I replaced only the harness and the affected sensor.
0 0%
I replaced the harness and both knock sensors. 7 63.64%
I replaced the harness and both knock sensors.
7 63.64%
Voters: 11. You may not vote on this poll

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Old 03-12-2020, 05:51 PM #1
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Post Knock Sensor Repairs - What did you do?

In what seems to be a fairly new phenomenon, I've got a code for Bank 2 knock sensor. It seems like these harnesses and knock sensors are reaching near the end of their ageing cycle and need to replaced. This is a low-mileage replacement JDM engine that I though would be fine, but obviously I was wrong. I did not replace either when I swapped engines.

I would like to know what you had replaced and the success rate of each. Money is sort of tight right now but I can make it work to replace both the harness and sensors. Please only vote if you've had the job done.

Also, I welcome links to cheap OEM knock sensors. So far McGeorge is the best prices I'm seeing.
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Last edited by gamefreakgc; 03-12-2020 at 06:03 PM.
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Old 03-12-2020, 06:22 PM #2
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My harness went bad only, but I replaced sensors because I bought them for cheap. All is still well ever since!
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Old 03-12-2020, 10:38 PM #3
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Quote:
Originally Posted by RS Dude View Post
My harness went bad only, but I replaced sensors because I bought them for cheap. All is still well ever since!
Where did you buy them from?
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Old 03-13-2020, 09:54 AM #4
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Quote:
Originally Posted by gamefreakgc View Post
Where did you buy them from?
Bought both off ebay from two different Toyota dealers.
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Old 03-13-2020, 10:04 AM #5
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I replaced just the harness when I installed my JDM. The old harness was very brittle.
They also sell sensors. The harness I received looked the part.
I had no issues prior to replacement or since.

GENUINE TOYOTA 4RUNNER TACOMA TUNDRA 3.4L KNOCK SENSOR WIRE HARNESS 82219-34010 | eBay
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Old 03-13-2020, 11:04 AM #6
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i was rebuilding and the harness pretty much disintegrated in my hand. they weren't cheap, i wanna say i paid 80 bucks a pop for OE with my buddy's discount but i had already blown my rebuild budget by then so another 200 bucks for those and the harness was worth not having them pop later
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Old 03-13-2020, 11:26 AM #7
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Replace all

Just replace all of it, do it once and call it good for another 20 years.
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Old 03-13-2020, 02:33 PM #8
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So, I also have a knock sensor related question.

My 1996 4Runner started displaying a check engine light indicating an issue with the knock sensor on back 1.

I took everything off of the engine and pulled and tested the knock sensors.

Both sensors show an open circuit between the terminal pin and the sensor chassis. (good)

When I plug a volt meter into them, one sensor shows about 2 mill-volts and the other shows about 6 mill-volts. In both cases, this voltage increases when I strike the sensor with a wrench. (good)

It looks like I have 2 good sensors, so I checked the wiring harness. It showed only a few Ohms of resistance from one end to the other. (good)

As it turns out, the replacement wiring harness I purchased on Amazon came with _2_ knock sensors!

So, (finally?) here's my questions:

What should I do?

1. Put the original OEM sensors back in and simply replace the harness?
2. Put in the new, non-OEM sensors in with a new harnes?

Given that I also found a heater hose that had sprung a leak under the intake plenum and filled the cavity with rusty coolant, could that explain why I got the CEL even though everything seems to test out as good?

What else should I check in order to clear the CEL?

What else should I consider replacing while I'm this deep into this engine?

Am I missing anything?

Thanks in advance,

Mike.
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Old 03-13-2020, 03:32 PM #9
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Replace the valve cover gaskets, intake gaskets, knock sensors and harness, PCV valve, clean the IAC and throttle body, plugs and wires, the 2 coolant lines to the AIC, the vacuum lines to the intake(injectors), the fuel pressure regulator and its gasket, all the injectors should be cleaned and tuned, and all the injector O-rings and rubber bushings should be replaced.

That should just about cover it....
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Old 03-14-2020, 01:01 AM #10
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Quote:
Originally Posted by Dieselchessy View Post
Replace the valve cover gaskets, intake gaskets, knock sensors and harness, PCV valve, clean the IAC and throttle body, plugs and wires, the 2 coolant lines to the AIC, the vacuum lines to the intake(injectors), the fuel pressure regulator and its gasket, all the injectors should be cleaned and tuned, and all the injector O-rings and rubber bushings should be replaced.

That should just about cover it....
Luckily I did all that when I swapped engines . I just didn't remove the intake manifold due to having to replace more gaskets.
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Old 03-14-2020, 01:56 AM #11
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Quote:
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Luckily I did all that when I swapped engines . I just didn't remove the intake manifold due to having to replace more gaskets.
Its been my experience that those metal gaskets with rubber edges that seal coolant passages are prone to corrosion. I expect youll find a pair of corroded gaskets when you remove the intake manifold.

I removed the manifold primarily to replace those gaskets. The knock sensor harness was a secondary item for me. I also did the seal for the stainless coolant pipe while I was in there. Easier to do all that with water pump off so you can clean out any debris that falls into the coolant passages.
Also a good time to clean carbon off the backside of the valves.

Everyone has a different set of experiences that drive their decisions.
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Old 03-14-2020, 06:36 AM #12
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Do you have to pull the intake manifold for this? If so - grrrrr - just had the valve cover gaskets done last week
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Old 03-14-2020, 10:31 AM #13
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Quote:
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Do you have to pull the intake manifold for this? If so - grrrrr - just had the valve cover gaskets done last week

Yes, but if your not experiencing problems dont worry about it. These engines will go a long way without issues. Especially if oil and coolant are serviced at least half as often as they should be.
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Old 03-21-2020, 12:45 PM #14
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So yesterday the code cleared itself (was still stored in the ECU) for about 15 minutes and then came back on. I'm thinking that's an intermittent connection from the harness?
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Old 03-21-2020, 11:20 PM #15
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Knock sensors and harness
Spark plugs and wires
Heater hose
All three serpentine belts
Radiator coolant hose
Timing belt
Water pump
Radiator and new antifreeze
Trailer wiring harness
Camshaft seal
Intake manifold gasket
Thermostat and seal
Valve cover gasket
PCV valve and grommet
Radiator cap
Couple oil cooler hoses

replaced all that wit new last week. CEL is gone
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