1998 Acura Integra knock sensor

I have rebuild my motor (1.8L v-tec) b18c1 last year due to a head gasket problem and water in block. My cousin and I put the the motor back together again and put the motor back into the car. All sensor had bee replaced with a motor at that time when we dropped it back to the car. Unfortunately, a check engine light came on when we took it for a test run. It was throwing a code 23 which was a knock sensor curcuit fault. At that time I was toatally out of cash so I waited a month to fic the problem. Bought a new from pepboys put that one to use but while installing the knock sensor I dropped it. Assuming that it was ok I finish installing and tested that one it was sure that the engine light came back on throwing the same code. So I went back and returned that one as a defected knock sensor and got a new one, hooked it up make sure the wire was plug in tight and make sure the wire was not cut ot split anywhere. I drove it, about some 2 min. And the check engine light came back on again. I am completely drained and fustrated because I need it to work and kill the engine to pass emmision to get my tag. Please help A.S.A.P. Thanks