Automotive Post Cat Sensor Code Diagnostics

My 2009 Saturn Aura (GM 3.6L) car sets an emission fault code for the post cat O2 sensor open or lazy. So I grab my automotive scan tool and start the car and decide to do a video on the diagnostics of this code.
Enjoy and hope it helps you understand a little on how emissions works.

[@davestewart9146]

Interesting, thanks Ted 👍😁

[@muc4149]

Is the STFT shifting from positive to negative telling us that the PCM has entered Perturbation?

[@tedsmarinerepair8956]

Stft is the fast reaction of the ecm trying to meet emissions. It shifts fast to make the O2 content correct