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Q: location of anti knock sensor on 1998 Subaru Legacy

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
Hi,
facing the engine, where is the anti knock sensor located on the 2.5 liter?

Also, is there a way to test?measure resistance, etc?

Thanks, in advance.
Jon G
No car image 94a1663db56199c5353592009e34aaa51078a2469bed068bb8d6f0ba43accf97
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The knock sensor is under the intake manifold right in the middle of the top of the engine. it is black about one inch in diameter about 7/16 of an inch high with a two wire black connector on it.
The knock sensor is a piezo cell that generates a voltage when it detects a knock it is tested using a oscilloscope and looking at a patten. Common Subaru fault code.
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