P0325 Nissan - Quest

Question

Where is the knock sensor located on the 2001 Nissan Quest

Answer 1

I would fix P0303 first since it will cause the knock sensor code to come on.

you might have to replace the spark plugs if you have not had them replace if the problem is still there you can try to swap an ignition coil with another cyclinder to see if the code moves over to the other cylinder

see picture below for knock sensor