The sprocket thing is the vanos unit.

DME is the main computer. Digital Motor Electronics.

Realtime reading of the cam angle with software and a laptop or I use foxwell NT510 will help root out what's going on.

Usually when the fault is within the cps, the primary symptom is the car will shut off on throttle off while driving slowly. Eg, coming into a parking spot the car will stall.

If the DME can't read the cam angle it will shut off the car to avoid self destruct. If the car keeps running but you get a code it's more likely to be something else.

Were it my car I'd swap vanos solinoids to see if the problem changes sides. A pressure problem from the solinoid for cause similar symptoms.

You can get a sense of chain guide health from tension on the chain through the oil fill port also when just shutting off the engine and it coasts to a stop, the tensioner drops to just the spring pressure and the chain will rattle if the guides are shot.

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2011 E70 • N55 (me)
2012 E70 • N63 (wife)