This car was running great, all of a sudden started it one day and very rough and would stall, ran at highway speed. Was giving camshaft sensor code and multiple misfires. Replaced camshaft sensors, no change. Replaced vanos solenoids, no change. Replaced both Disa valves(these were clearly bad) car ran much better but still rough at idle. Giving misfire codes and p013b code. Unplug coils one at a time and no change in the way the engine runs. Help!!!
I would check o2 sensor bank 1 and short and long fuel term. If you have INPA with live data, O2 sensor should oscillate from 0.2 to 0.9V.
Also check for vacuum leak and fuel supply pressure, MAF sensor.
Just to update and provide a solution, it turns out that the Vanos bolt recall was never done, the bolts sheared off.
Wow that’s a disaster didn’t know that even was still happening always remember when you buy a bmw always always check to make sure there ain’t any outstanding recalls
Lucy for me it is a friend's X3. Since the recall was never performed on the car, BMW is performing the recall now.