The knock sensor is located under the intake manifold which needs to be removed to replace the sensor.
Here is a guide and some diagram (below) so you can get the job done.
https://www.2carpros.com/articles/replace-intake-manifold-gasket
Please let us know what happens and upload pictures of the problem.
Cheers, Ken
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Monday, September 4th, 2017 AT 8:19 PM