ok this is what i did to test the knock sensor,i had put the black tester on the battey and the red on the harness and i got a reading of 550, whcich was average. and the code still comes up wat can it be? ......can anyone help me? please

 

I had a similiar problem

 

But I took it to the dealer and they said that the knock sensor was not bad, I don't know they reset the ecu and I have not seen it again