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I replaced knock sensor after reading code but still had same code what can I do

(1999 Infiniti I30)
in Potwin, KS on April 18, 2013
after replacing the sensor I also tried replacing ckt. still got same error code,and now it tells me that there is a link up error,it wont read,and the old ckt. is hooked bak up what could be the problem?
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