nickbabam

I know this issue may have been discussed in other threads but looking for some info that may help.

2005 nissan maxima automatic 3.5l v6 197500 miles

I bought this car because my last one blew a head gasket, and now this one won't pass emmsions due to DTC.
I've tried to diagnose the issue myself with no avail so heres what ive done:
cleaned EGR and Throttle body
Catalytic converter runs hotter after catalyst which indicates a clog but-
exhaust outlet is mostly clean, not
Good power
21 mpg avg
Exhaust smells clean
I've run 1 full tank worth of cataclean, and am halfway done with second.

I get the feeling that the catalyst may not be the issue. Maybe the 02 sensors and if so will cleaning them get me to pass emmisions for the time being? On a time crunch.

Car runs great though! Has a bit of a rough idle when cold and timing chain makes some noise but I've read that it is common.

I also have gotten a p0507 since cleaning my throttle body and can't get that to go away. I've tired to get the idle relearn to stick but cant. Also weird because it idles at around 650 rpm when warm. RPM gauge is erratic when braking, don't know if unrelated.

Sorry that the information is all over the place but looking for something that might cause the code. If there's anything I should look at let me know... I plan on getting it on Jack stands soon as I noticed a hole in a flex pipe but no sound of exhaust leak.