Recently I have noticed that whilst driving there is a very high pitched whining coming from the front of the car. On closer visual inspection with the engine running I opened the bonnet to try to locate where the noise was coming from. The sound seemed to be originating from around the alternator, near where the cam belt is. It has been getting louder recently and the car is due for a new cam belt in 3000 miles or so. The noise remains constant as I turn the wheels so presumably it isn't the power steering pump.
Can anyone clarify what is actually the problem or how to go about diagnosing it? I have had the EPC light come on on the dash board which I presume is due to one of the engine parts being faulty?