What is this suspension part?
 

I am trying to diagnose random knocking sound on my 2014 ES300H and came across this part on right rear arm, it is wired and seems like height sensor but it's not showing up in online parts list.

Does anybody know what this part is?

https://cimg8.ibsrv.net/gimg/www.clu...1c477217f7.jpg

Found the answer here https://www.clublexus.com/forums/es-...-question.html