Quote Originally Posted by prn31 View Post
What year model is your R36? The newer models (MY10 onwards) seem to have less issues with timing chains. There was a guy on the forum who had problems with cam adjusters, which turned into a money pit. Have a look at this thread:
Cam adjuster issues 2010 R36

I would probably get it checked out by a VW specialist as a precaution. It could be nothing or it could come back to bite you.
In my case this ended up just being low/bad quality oil it seems.. Which isn't amazing, I've had it appear twice now and it seems to be far less frequent with oil changes. I may try a known working sensor and see how that goes as well when I get time.