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I bet you have a short to ground in your knock sensor wire, meaning the shielding has broke threw and grounded out your signal wire. Best bet it to check voltage at teh ECU with teh key on you should see 2.5 volts anymore or less indicates a problem, must likely you will see less than 2.5 volts for a short to ground.
Your code 45 is most likely do to your problem with the knock sesnor as I just described above.
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