Well it's not particularly good for the car. Do you have any problems with cutting out/loss of power at all? The ecu looks for not only bad signals from the knock sensor but also constantly looks for a good signal too. If it doesn't get it, it will retard the timing and basically fall into a limp mode.
The na 16v sensor wont work properly either so you'll probably have to source another gze one if you're having problems.
Eddie.