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I had one recently also, but I have a catted downpipe so was worried that might be the cause.
I pulled the code using bimmerlink and it said Crankcase ventilation system: leakage detected.
I had done Oil change service at the dealer just a week prior. Removed engine cover to inspect and observed oil all over the engine and pooled up in certain areas. Was also smelling burning oil which this explains why.
Dealer inspected it, said I had no leak and attributed it to recent oil change. Tightened some screws and pressure washed the engine bay and cleared the code. A couple days in and no code yet - So far so good
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