Camshaft sensor P0340 trouble code?

So, here is the thing about this code, it could be the sensor but most of the time it will be a worn out timing belt, when the belt wears it does not hold the cam steady when the engine is running and then the computer picks up on it and gives this code,

P0340 - Camshaft Position Sensor Circuit Malfunction

Lets try them sensor first and then go for the timing belt, can I ask if while cold the engine makes a slight rattle sound at idle? If so the timing chain will be the issue. Here is the sensor location while it looks like you will be bale to check the belt as well. Check out the images (below). Please upload an image or a short video in your response, so I can see what's going on. Ken