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Error is about knock-sensor CIRCUIT, not just sensor itself. So measure continuity of wires between ECU connector to sensor to verify nothing's broken. Inspect connectors for corrosion. Finally, measure impedance of sensor at ECU connector.
 
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Shop manual to ID correct sensor and circuit path.
Eyeball inspection of all parts from knock sensor to ECU.
Voltmeter for circuit input/output testing etc.
Also this is an Ignition knock sensor (combustion charge pre-ignition)....doesn't have anything to do with rod knock (connecting rod failing)
 

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Thank you! does anyone have a pdf of a 2012 cbr600rr manual? mine didn’t come with it and i can’t find one on google

Not cheap but still worth the price of you do your own wrenching.
 
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