Knock Sensor?

Where is the knock sensor on a 93 Buick Century? Is thing worth getting replaced?

It would be helpful if you posted the engine size as they are located in different areas on different engines.

its a v6

I'm not a hundred percent sure, but I think it's on the rear of the engine(near the firewall). It almost looks like an oil pressure sending unit. Or if you look through the RF wheelwell you can see it directly behind the oil filter.