now I'm confused.

I did not realise that there were 4 cam shaft position sensors

I had the error code 114/8 - P0345 - cam shaft position sensor 'A' circuit bank 2

so I changed the cam shaft positioning sensor as shown in the photo - the one on the right hand side of the engine at the front. (looking from the front of the car)

where is the exhaust cam shaft positioning sensor? would this be on the same side but at the back of the engine?

A day or so after changing the sensor and resetting the codes I had the same error code come up again?

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E61 525i 2004 M54 Auto
E46 320i 2002 M54 Auto
E46 330i 2003 M54 Sedan Manual