yosam34

Hi guys, new here! need some help please. I had a mad idea and purchased a 2002 330ci as my everyday car. I absolutely love it but it has a few problems that I am slowly working through. Alternator failed so I have replaced this, since replacing there is a constant whistle at low RPM - when I disconnect the alternator the whistling stops - I am presuming that I have a dud alternator? I also have PPPPP or Code on the dash (I have tried leaving battery disconnected etc, the dash switches between PPPP & code). I've put a new Bosch battery on as well, as the other was small & wedged in with cardboard. Pulling my hair out a bit. Any advice greatly appreciated. Many thanks Sam