M272 -- should I change knock sensors?
 

I have my intake manifold off, and I would like to advice on whether its worth changing my knock sensors @ 120k while I have the manifold off or just leave them alone? No codes or anything, just for preventative?

On the M272 does anyone know if they go bad? They are not too expensive, but sometimes stuff just prefers not to be touched...

http://w124-zone.com/downloads/photo...manifold/4.jpg

They don't go bad leave it alone