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Knock Sensor

Tiny
FREEHEAL
  • MEMBER
  • 2004 TOYOTA 4RUNNER
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 136,000 MILES
Where is the Knock sensor on the 4.0L V6? Do the Heads have to be pulled to replace the sensor?
Tuesday, May 3rd, 2011 AT 2:08 PM

7 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Looks like they recommend removing the cylinder head to replace them but I have replaced them without. It is actually located under the intake manifold, but appears to be trapped until the head is removed, but like I said you can do it without removing the heads. See the attachments below for instructions on replacement.
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Saturday, July 2nd, 2011 AT 1:01 PM
Tiny
ANTHONY STAMATION
  • MEMBER
  • 1 POST
  • 2003 TOYOTA 4RUNNER
  • 3.0L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 129,000 MILES
So I am throwing a code for my knock sensor I figured out that the knock sensor is or should be located underneath my intake manifold. I just need to know which side of the engine? The battery side which is the left and driver side or the alternator side.
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Friday, October 12th, 2018 AT 6:03 PM (Merged)
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
There are two knock sensors which you will see in picture. This is a 4.0L not a 3.0L do not over torque these as it can damage them. 15 ft lb or 20NM.
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Friday, October 12th, 2018 AT 6:03 PM (Merged)
Tiny
HECK2
  • MEMBER
  • 1 POST
  • 2002 TOYOTA 4RUNNER
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 193,126 MILES
I"m trying to locate the knock sensor on a 2002 toyota 4runner
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Friday, October 12th, 2018 AT 6:03 PM (Merged)
Tiny
MHPAUTOS
  • MECHANIC
  • 31,937 POSTS
Hi there.

Check this post I think it should be the same as your's, I will re check Mitchell 1 for your exact year and advise if different, I won't be able to do that for a few hrs though.

Mark (mhpautos)

P.S Raz has posted what I was going to add, so check yours against the pic.
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Friday, October 12th, 2018 AT 6:03 PM (Merged)
Tiny
WATERFALLS
  • MEMBER
  • 1 POST
  • 1996 TOYOTA 4RUNNER
Engine Mechanical problem 6 cyl Two Wheel Drive Automatic 213000 miles

I need to know the location of the knock sensor on a 4runner 3.4L sr5 2wd

This site rocks BTW
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Friday, October 12th, 2018 AT 6:03 PM (Merged)
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,310 POSTS
Hello,

The knock sensor is located under the intake manifold. Here are some diagrams (below) plus a guide that will give you an idea on what you are in for when removing the intake to replace the knock sensor.

https://www.2carpros.com/articles/replace-intake-manifold-gasket

Please let us know if you need anything else to get the problem fixed.

Cheers, Ken
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Friday, October 12th, 2018 AT 6:03 PM (Merged)

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