I have a P0430 Bank 2 Catalyst Eff ??? Below Threshold??? And also a knock sensor code. I am doing a KS relocate as soon as I get the KS and Harness in. I have read on this 0430 code and I think I read that sometimes that a KS problem will make this show up as a problem. Also I checked the temperature on all 4 cats and all 4 were around 360 to 375 degrees. I figured if one was stopped up then it would be much hotter. Also could an O2 sensor be throwing this code? The way I read this is the top cat on the drivers side (Left) If this is my problem where do I get one and how much should I pay for it. And should I wait and do the KS relocate and clear my codes and see if this comes back? My gas mileage has dropped and I don't know if its just from the KS or this or both. Thanks for any help!