Question about 2004 GMC Yukon

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How do i change the knock sensor on 2004 gmc yukon and where is it located

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The person who stated they are under the intake manifold is a tool! They are located below the exhaust manifold(one on each side) and are quite simple to replace. Be sure not to overtighten them as they can become too sensitive and may cause detonation. Should be about 16 ftlbs but I would check to be sure. They run about 55 dollars each aftermarket and are about 85 from GM depending on where they are purchased from.

Posted on Oct 17, 2010

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You actually have two knock sensors on this vehicle if it has a V8. They are located under the intake manifold, which you have to remove to replace them. Word of advice- if you choose to replace them yourself, get the sensors from GM. The aftermarket sensors have issues and you don't want to do this job twice.

Posted on Sep 17, 2010

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Posted on Jan 02, 2017

BigBlue77
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SOURCE: 2003 GMC Yukon

You will have to remove the intake manifold to gain access to the knock sensors. There are two sensors in the valley under rubber plugs. The sensor in the rear has a tendency to fill up with water and cause trouble. You have to make a dam with RTV to stop the water from getting in there.

Posted on Sep 06, 2008

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SOURCE: where is locate the knock sensor in 2004 yukon xl

There are 2 or them and they are under the intake manifold. The manifold has to be removed to replace them.

Posted on Oct 10, 2009

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SOURCE: how to repalce a knock sensor

Hi welcom to fixya. A defective knock sensor may cause engine detonation or reduced spark advance and fuel economy. When a knock sensor is removed and replaced, the sensor must be tightened to its specified torque. If the knock sensor is installed tighter than it should be, it may become too sensitive and provide an excessively high voltage signal, resulting in more spark ****** than required. When the knock sensor is installed looser than it should be, the knock sensor signal will be lower than normal, resulting in engine detonation.
To replace the knock sensor:

  • Disconnect the knock sensor wiring connector.
  • Then, unscrew the sensor.
  • Remove the knock sensor.
  • Reverse the procedures to install the part.
  • 15 ft.lbs.torque
  • hope this helps.Thank You for using fixya..iluv2fish.. Ray..

Posted on Jul 09, 2010

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Related Questions:

1 Answer

How many o2 sensor are on a 2004 gmc yukon


Hi Charles,

GM products have 4 O2 sensors attached along the exhaust pipes coming off the manifold. Bank 1 is aligned to cylinder 1 on the engine which is the driver's side. Sensor 2 is the one after the convertor (Sensor 1 being the one before the convertor). Link attached for more information.

Oxygen Sensor Locations

I have changed out one of mine; quite easy, but you need a sensor wrench which you can find an any automotive store for around $15.

The part is available readily enough - link attached.

Good luck

Feb 07, 2015 | 2004 GMC Yukon

1 Answer

Where is the knock senser on a 2004 yukon xl & how do I replace it


it is located under the intake manifold and there are 2 of them

Oct 26, 2012 | 2004 GMC Yukon

2 Answers

How to repalce a knock sensor on my 2004 gmc yukon


Hi welcom to fixya. A defective knock sensor may cause engine detonation or reduced spark advance and fuel economy. When a knock sensor is removed and replaced, the sensor must be tightened to its specified torque. If the knock sensor is installed tighter than it should be, it may become too sensitive and provide an excessively high voltage signal, resulting in more spark ****** than required. When the knock sensor is installed looser than it should be, the knock sensor signal will be lower than normal, resulting in engine detonation.
To replace the knock sensor:
  • Disconnect the knock sensor wiring connector.
  • Then, unscrew the sensor.
  • Remove the knock sensor.
  • Reverse the procedures to install the part.
  • 15 ft.lbs.torque
  • hope this helps.Thank You for using fixya..iluv2fish.. Ray..

Jul 09, 2010 | 2004 GMC Yukon

1 Answer

04 Yukon is having trouble accelerating sometimes..


Not the knock sensor
A mechanically bound fuel pump, could though,thus low fuel pressure
A bad fuel pressure sensor ,also

May 14, 2010 | 2004 GMC Yukon

2 Answers

Wanting to know how to change knock sensor on 2001 gmc yukon


Knock sensor is located on side of engine block screwed into a block coolant drain, your best access is from underneath the vehicle. Coolant will run out when you unscrew it so be sure the engine is cool. Just unplug the wire unscrew the sensor, screw in the new one and plug the wire back in. Also be sure to top off the radiator if you loose any coolant.

Mar 11, 2010 | 2001 GMC Yukon XL

2 Answers

Trying to find out where a knock sensor is located on a 2004 gmc yukon


There are 2 knock sensors on some of those, one screws into the block drain near the starter the other near the left exhaust manifold.

Jan 24, 2010 | 2004 GMC Yukon

1 Answer

Where is locate the knock sensor in 2004 yukon xl


There are 2 or them and they are under the intake manifold. The manifold has to be removed to replace them.

Oct 10, 2009 | 2000 GMC Yukon XL

2 Answers

I have a 2004 gmc yukon when I try to start it it just cant kick over, the battery is fine it just cant get the final kick to start


Check the "knock sensors" under the intake manifold, notorious for water damage. Need to check the fuel pressure as well. Fuel pump could be bad. Has the "Service Engine Soon" been on at all? It's all a "**** shoot" without the proper testing equipment.

Dec 15, 2008 | 2004 GMC Yukon

1 Answer

2003 GMC Yukon


You will have to remove the intake manifold to gain access to the knock sensors. There are two sensors in the valley under rubber plugs. The sensor in the rear has a tendency to fill up with water and cause trouble. You have to make a dam with RTV to stop the water from getting in there.

Sep 06, 2008 | 2003 GMC Yukon

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