I need a diagram to locate the knock sensor on a 2003 Nissan Xterra

po328 is a knock sensor code ,0174 &0420 are emissions codes. Possibly a faulty knock sensor throwing out the timing, It may just have a vacuum leak causing it to run lean, affecting the timing causing knock sensor code, Scan for live readings, ck knock sensor, o2 sensors, A/F ratio & converter,clogged injector ect. Good luck
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unless your xterra is supercharged, you really do not need to replace it. its a lot of work, because its located way down under the upper plenum and lower intake. its way down there. if it is supercharged, you do need to replace it, because it puts the supercharger into fail safe mode and truck till not run to its full potencial.

The location is in back of the engine on the top of the transmission

I have looked everywhere and also went to my 2 of my parts suppliers and there is only one knock sensor for your vehicle. Below are pictures right out of my Nissan Factory Service Manual and it does only list 1 knock sensor. If you have any questions or need any testing procedures feel free to email me at [email protected]. and I will send what I have.

Hello the sensor is located under your intake manifold you will need to remove the intake manifold to gain access to it here is photos of what and where your looking for this

The knock sensor is on the back side of the engine bolted onto the block. It looks like this

Here the answer, dont flood!!!

Good luck.

V6 3.3L The sensor is located underneath the air intake manifold on top of the engine block. This should take an experienced mechanic about 3-4 hours to replace.



Fig. Engine compartment component locations

Hope this help (remember rated this free help) Good luck.

Your knock sensor is located undernesth the air intake manifold on top of the engine block. This goes for 2000-2004 xterra V6 3.3L models.

It's the valley of the engine underneath the intake manifold. It's about an $800 job because the top of the engine has to come off. However, unless you have a supercharged xterra it shouldn't effect performance. Also, the knock sensor will not trip the check engine light, as it does not indicate a primary problem, so if your light is on you should have another code that should be fixed first.