Originally I was getting intermittent O2 codes that would go away when I cleaned each respective connector under the hood and reset the ECU. Now, no matter what I do I still get all 3 O2 sensors failed and the knock sensor. I read somewhere there is a harness problem with a TSB from nissan that deals with this issue. I can't find it or any details now. Does anyone have experience with this?
If it's wiring I'd like to know before I replace $350 worth of parts that I may not need.

Thanks

Paul