Help, crazy knock sensor reading, low 02 sensors
 

So my cars been throwing codes p2a00 p2a03, for upstream sensors, got those replaced as well as switched out cats for test pipe, its a nismo 2012 370z, with a tomei catback and Y pipe. Finally got around to scanning it, and its was throwing a crazy knock, in the thousands, and 02 sensors read low, and sometimes not at all lol, but car runs fine so, im thinking it might be a connection/wiring. Let me know what you guys think anything helps.

You should have dealt with these issues first prior to test pipes.
O2s should have a spacer now with the tespipes.

The 02 sensors are brand new Densos that I changed before taking off carts. I took the cats off because they were blown, I thought it was responsible for the 02 codes. So its not the actual sensors.

Now that the cats are off. 02s will be off.
Either space them or disable them via tune.

The test pipes have extensions for the 02 sensors, its not the test pipes.. Did you see the picture? My knock sensor reads 12k lol, code occurred even when I had cats.

Many times this could be due to an exhaust leak if wiring checks out.

Spaced out 02s should work.

A vacuum cleaner on blow through the mufflers + some soapy water at your exhaust flanges will point out if there are any exhaust leaks.

Lastly a measure of your Fuel trims will point if this is an exhaust issue created by an intake leak.

Fuel Trims b1 and b2 are in the picture. The percentage between them is way off, what should they be at? One says 118% and the other 98%.