This part makes a high pitch loud sound when engine is running. On a 2011 Jaguar XJ SC. There is another one on other end of engine but that one is fine.

 

That is one of the 4 cam timing adjuster motors/solenoids. They adjust the cam timing to advance or retard timing. If you look a little below that one pictured you should see another one and on the other bank there should be two of these, also. I had one that went bad within the first year I had my XJ and it made for a slightly rougher idle and impeded performance acceleration a bit. Mine was on one of the exhaust cams and yours appears to be on the intake cam.

 

Just one of the reasons why a replacement 5.0L SC engine costs $50,000! OUCH!
https://www.jaguarforums.com/forum/x...k-tick-192337/