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I have an automatic 2010 R56 with 50K on the clock, It has shown code 2845 from time to time and suffered occasional stalling at junctions. I checked all the easy things, oil level, VANOS filter screens and operation, vacuum pump and exhaust camshaft position sensor and all fine. With low mileage and careful use (wife owned from new) I felt the VANOS unit and timing chain should be OK. There was a slight sound of timing chain rattle but nothing like the death rattle people describe. So I changed the timing chain tensioner. Not too difficult, just remove the airfilter housing and throttle butterfly body and then its easily screwed into the back of the engine. Its just a spring loaded plunger which is also pushed by oil pressure and bears on the rear chain guide. The new unit had a much firmer spring than the old one. So now the code and stalling have gone and the engine is a bit quieter. I also swopped over the exhaust and intake VANOS solenoids just in case I had it wrong. The latter step is a no cost option if you are struggling, both units the same and would show a changed code if one solenoid valve is faulty. The tensioner was also a lot cheaper than a solenoid unit.
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