The fault could be caused by camshaft position sensor, however there are (I believe) either 2 or 4 sensors covering the two banks of cylinders. You have misfire faults on both cylinder banks. The chances of two camshaft position sensors going wrong at the same time are fairly remote... I don't think they're easy to check without an oscilloscope. In all honesty, my money's not on the camshaft sensors, but still with the crankshaft position sensor.