Cross Traffic System Fault -- Guessed At Repair

In this video I'm trying to figure out what's wrong with my 2011 Lincoln MKZ. The Parking Aid System has failed and I kept getting alerts which read Check Rear Park Aid and a Cross Traffic System Fault. I found this extremely annoying and I couldn't find a fix. Taking the car to a dealership was something I did not want to do because of how much they could charge for a repair of this kind. The car didn't return any fault codes and online didn't help either. I did find one post in a forum that said check the parking aid system speaker. So, after a few tests, I decided to take a chance and guess at the repair and replace the speaker hoping it was the problem. Thanks for watching...
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Here is a link to the part:
https://www.amazon.com/Allstate-Electronic-Expedition-Navigator-4L1Z-15K864/dp/B07BFQG1HP

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