cam angle sensor au1

[paddle]

could someone please tell me where to fine the cam angle sensor on my au1,im led to believe that this is the main reason that my car is running like crap and chugging black out of the exhaust,I have replaced injectors,plugs,leads,oxygen sensor and maf sensor and still no change,fuel economy is out the window,plugs are black within a few weeks and oil is black and dirty within a fortnight,I am using no oil or water whatsoever,levels are fine but having to do an oil change once a f/n is really starting to peeve me off along with the price of fuel,getting lpg later this week YAY!