I just replaced the drivers side valve cover gasket and upper timing cover gasket on my 2005 X5 with the N62 V8. 202,000 miles. I went thru the relearn procedure 3 times for the valvetronic motor. It starts right up but after about 30 seconds a knocking or rattling sound begins and code P0021 comes up as a pending code. (Bank 2 timing over advanced or retarded).
So I removed both Vanos solenoids valves and replaced the inner smaller o ring. I had only replaced the o ring in the timing cover on my first try. I also cleaned the valve with parts cleaner and noticed that the screen was partial clogged. I was certain i had found the issue, but on restart and relearn i have the same issue.
I am wondering if i have the Solenoids fully seated. It looks the same as the passenger side but i can see the green o ring.

Any other ideas or things to check? Help would be greatly appreciated.

I did a complete VC and timing cover gasket replacement job on the passenger side with no issues.

Thanks I am out of ideas but have to have it towed to my mechanic but am into this about 20 hours.