ECU codes 33, 34, 53, 77 HELP!
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

 

They're read like this, 0303 - Front Left Heated O2 sensor
0304 - Knock Sensor
0503 - Front Right Heated O2 sensor
and last but not least 0707 - Rear Heated O2 sensor

sounds like your car needs a whole lotta sensors to me.

 

I think theres a o2 sensor fuse, this may be your problem. Check the fuse and if it is fulty replace it and your problem will be gone, if not then I have no clue.