I've been researching this subject off-and-on for two years now, and your post is the first time I have ever heard anything that relates a ks code to the cooling system. Please tell us more. I have replaced almost everything on that engine and still can't get the code to go away. Never heard a single ping either.This entire post is based on totally false information.
1st gen xterra cooling systems and heat sink on these engines cause knock/ping. Fix the cooling system and the knock sensor issue goes away. Low speed, hot conditions and loading overwhelm the cooling system.
In other words, by hiding the knock sensor issue, damage is still being done, you just made a patch to hide the alert.
Fix it correctly by retrofitting your cooling system with a few mods. It irks me that so many people have wasted untold thousands of dollars on this. Lead a horse to water, can't make it drink, my dad use to say....