The next thing i would check is locate all of the ground wires under the hood (grounded to the body) Shiny clean with sand paper and replace. while i am at it I would do the same to grounds to the frame.this may solve your problem . If your grounds are not well connected you will spend many UNESSARY dollars in parts and labour.
SOURCE: 2000 nissan frontier knock sensor code & distributor
no but the knock sensor does send a signal the ecm and it will ****** or advance the distributor timing
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