2000 Subaru Outback Check Engine Light Came On Car Computer Knock Sensor Replace

the check engine light came on in my car and the computer said it was the knock sensor so i replace it for a brand new knock sensor but still after i replace it the check engine light is still on and is still having the same code and telling me knock sensor is the problem or a poor conection and what would be the best way to make sure is the sensor or the conection?