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So the next question is to see what the stored codes are. Done that yet.

True. However on the CPS, if it was changed on some schedule, say every 100K, the likelihood of it failing would be reduced even with other brands. I know there is an issue with off brand O2...

The CPS is as stated a magnetic sensor. It needs voltage to work properly and then that voltage needs to be interrupted as the metal on the fly wheel passes it. Heat and long use affect this...

This sounds like the infamous crank position sensor. They can go completely all at once, but more commonly they do this intermittent death. Fairly easy fix.