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this isn't a simple repair job, the knock sensor must be replace, I would also make sure that this IS the knock sensor that is the issue here otherwise if you replace and clear the codes the same issue will appear again, sometimes the engine computer will throw a code that is correct but misinterpreted which I believe might be your case,If you have a knock sensor code on any Nissan (in my experience) replacing the knock sensor will not fix it. The knock sensor detects unwanted engine vibrations, such as miss fires. So if you have a knock sensor code first check your spark plugs, are they in proper condition? (if not replace them). Next quest vans are known for clogging fuel injectors so i would recommend running a can of sea foam injector cleaner.
It is not a bad knock sensor necessarily, no code indicates a part is defective just that a problem exists in that circuit, this is where do it yourselfers get into problems. Have it properly diagnosed by the book on special equipment.
There are two knock sensors located on top of the Engine, approximately in the middle of the 4 cylinders at each bank. To get access to the sensors the black plastic engine cover with the "Jaguar V8" imprinted on has to be removed.
There are two types of knock sensors. The "old" ones that are of a "screw-in barrel type" and the newer ones that are just bolted on.
I describe the replacement of the bolt-on type knock sensor on Bank 2 in the following documentation on a 1999 XJ8 AJ27 engine.
Be careful! Knock sensors are piezo electric devices that are very sensitive! If dropped, over-torqued or struck they will probably be destroyed. As knock sensors are sensitive to a sudden temperature change they are also easily fractured by steam blasting a hot engine. So handle the knock sensors with great care and let the engine always cool before fitting a new sensor!
A knock sensor tells the engine computer when one or more of your engine's cylinders are "knocking", that is, exploding the air/fuel mixture in a way that delivers less power and can be damaging to the engine if prolonged. The computer uses this information to tune the engine so that it doesn't knock. If your knock sensor wasn't operating properly, so that it was always indicating a knock, the engine computer's response may have been to change the ignition timing on your engine. Knock sensors generally bolt into or thread into the engine block.
This P0325 code may show up intermittently or the Service Engine light may be lit constantly. Other knock sensor related DTC codes include P0330.
Symptoms: You may notice drivability problems including a lack of power and perhaps some hesitation. There may also be other symptoms.
Causes: A code P0325 most likely means one or more of the following has happened: * The knock sensor is faulty and needs to be replaced * There is a wiring short/fault in the knock sensor circuit
Possible Solutions * Check the resistance of the knock sensor (compare it to factory specs) * Check for broken/frayed wires leading to the sensor * Replace the knock sensor
It is somewhat complicated to change the knock sensors. There are two of them and they are located under the intake manifold. The intake manifold must be removed. I would recommend tha you replace both while you have the engine apart.
What leads you to believe the knock sensors are bad, I've seen few bad knock sensors? The knock sensor issues more times than not have been caused by other problems.
After you remove the intake manifold disconnect the knock sensor connectors. Remove the bolts and the two knock sensors then replace with new knock sensors tighten the bolts to 15 foot pounds. Reinstall manifold. The total job for an experienced mechanic with tools is about 5 hours. Not a good job for a beginner.