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Re: 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.
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Hi, there should be one on each side of the engine in the location shown below. Bank one is the driver's side and bank 2 is the passenger's side. Please let me know if you have more questions, and thanks for using FixYa.
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.
hope this helps.Thank You for using fixya..iluv2fish.. Ray..
The most likely cause of your code is a bad rear knock sensor. You should check the knock sensor wiring harness for corrosion. But if that checks out the sensor will have to be replaced. The knock sensor is under the intake manifold, although it's not too difficult to remove. Both knock sensors should be replaced along with the wiring harness, just because of labor involved in gaining access to the sensors. You could try clearing the code, it may stay off for a long time.
Need more information but here is where all your O2 sensors are located
Bank 1 Sensor 1 - Driver's side, before catalytic converterBank 1 Sensor 2 - Driver's side, after catalytic converter Bank 2 Sensor 1 - Passenger side, before catalytic converter Bank 2 Sensor 2 - Passenger side, after catalytic converter Thank you for using fixya and good luck
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.