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I had the same issues recently (30C1 and 3702). Luckily it wasn't anything major.
There was oil leak (gasket) in the oil filter assembly and replaced the gasket and oil filter.
No issues so far (driven about 100 miles on the motorway and local roads). Code used to return after driving 2 - 3 miles after cleaning only Vanos sensors.
Please check for oil leaks and change the oil filter to see whether it makes it better.
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