Camshaft sensor position on 2001 nissan almera?

My trusty Almera recently developed a engine light fault and eventually stopped starting. RAC came out to diagnose the issue and said the Crankshaft sensor was faulty. I'm about to pick one up but with it comes a camshaft sensor and I'd liek to fit that also. Can any one tell me where I can find the little blighter on my engine....fingers crossed the timing chain isn;t the cause.