What causes the knock sensor to keep going off on a Acura Integra GSR motor?

I have a B18C motor in a 1996 Honda Civic, which was recently swapped out. The first time the check engine light came on and it read that the knock sensor failed. So it was replaced, after a few days later, the check engine light goes off again with the same reading. Knock sensor failure.
Update: I have a B18C motor in a 1996 Honda Civic, which was recently swapped out. The first time the check engine light came on and it read that the knock sensor failed. So it was replaced, after a few days later, the check engine light goes off again with the same reading. Knock sensor failure. I use Shell or Chevron 91 OCT.
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