I have some symptoms pointing to an 02 sensor issue. Have seen the "cleaning" of the 02 sensor videos/etc... lightly sand the outside, soak/spray the holes of the sensor. Some soak in gas overnight, some spray with carb cleaner or throttle body cleaner. Is cleaning this sensor just bullshit or what? Anyone try it?

 

Not worth the time. It's bull shyte. Most O2 sensors can be found for relatively cheap these days.

 

If the O2S/AFR is sooty/dirty then there is something else wrong.
After a while O2S/AFRs will become lazy, they will not set a code but the engine will not run properly.
Pickup a new Denso unit from RockAuto.