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Same Issue

I'm having the same issue. My car is NOT throwing any codes. However, when I get the emissions tested, it says my o2s are "not ready". I have been trying to fix this since May, 2019. I have put in a new ECU and new rear o2s. My 02 heater is showing "ready". It is just my o2 sensors saying "not ready". Has anyone found a fix for this?
 

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A previous owner most likely tuned the car and the tune is preventing the readiness. He may have accidently forgot to include the tuner device for future owners. ?..You will have to pay a dealer to reflash the stock tune back into the ecm.... It happens...
 
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