Is there any other code associated with your knock sensor code? An all out knock sensor failure will give primary symptoms like an erratic idle and secondary symptoms like horrid gas mileage. On my 99 qx4 I had two codes stores one was the knock sensor and the other was an emissions component. ( didn't say specifically) In most cases a doesn't equal b. For example a faulty air temp sensor triggers a knoc sensor code because these two items work off each other.
Double check your work, see what comes back and report back.
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