If you are lucky you may still be within the 10 year extended warranty for this VANOS bolt issue. I was just past the 10 year mark, so I was fortunate to have the SULEV 15 year / 150k mile emissions warranty.
I only put a few miles on the car after hearing the rattling sound and still I had two sheared bolts.
Replacing the bolts doesn't look too bad, just that getting the valve cover off is a bit of a pain.
Good luck!
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