Some shop told me to replace and the KS and the harness, not sure if I should do it cause, I've never heard of anyone doing it for the 304 code, have you? Thanks.

 

It's like 15 dollars I think, but if once you change the KS and you're still getting the 0304 code, then I would change the harness, if not, leave it. I didn't cahnge mine because once I changed the KS, my 0304 went away

 

If the information given to me is correct, there is no direct replacement for the harness. it would appear that there would be from the sensor under the manifold to the harness on side of the engine but they do not have a direct replacement. they have one similar to splice into the oem harness connector if you have trouble.