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KNOCK SENSOR SIGNAL
--OPEN OR SHORT IN KNOCK SENSOR SIGNAL
--KNOCK SENSOR/CIRCUIT to ECU
Having no knock sensor could be bad when your giving it shit.
See if any of the wires have come off the sensor ( i dont know where it is) if not the sensor has probably died.
Reset the ecu (disconnect battery for a bit) and do the diagnostic test again after you drive it.. If it comes back you know theres something definatly wrong.