[ellev8or]

I've just paid $400 to replace the cam sensor interruptor magnet and cam sensor. Arrived home and cleared the codes and the 'Check Engine' light is still on. I checked it to see what codes were popping up. At first, it was code 31 and 41. Now its only 41. What else could be causing the code? The tech at the shop stated that the harmonic balancer and the water pump pulley could cause code 41. Is this so?

Thanks in advance.