I bought a 04 civic ex and it has died on me about 5 times at idle when coming up to stop signs and lights. I read the engine codes and it says camshaft position sensor A circuit intermittent B1 and another says bank 1 or single sensor. It is also throwing some oxygen sensor codes due to the fact that this car has a aftermarket manifold. So my question was, how many camshaft sensors are on this car, I have seen two videos and they were both by the timing belt. Also, is the timing belt hard to replace if I need to switch out this cam sensor. Thanks