We are, of course, all suffering with you. As many of us have walked in your shoes... and we feel your pain.
There seems to be a common issue with this set up.... and that is -- a very fat fueling issue. IF this was my car I'd be searching high and low for the cause before wasting another motor. That can get expensive real quickly! Ask me how I know! LOL
There's many cause's for EFI to get false O2 readings. Leaky injector... bad MAP... a bad heating circuit allowing the sensor to cool off during idling... a burned or unseated exhaust valve... leaky exhaust... just to list a few. The O2 sensor plays a very critical role in fueling the engine... but it can only do one thing - read the oxygen in the exhaust.
The odds of having TWO failed O2 sensors with so few miles just seems very very unlikely. These things are pretty robust. Something else is awry. What that is - is your treasure hunt.
With the motor out of the car -- I'd start with the wiring - and it's routing. All of the sensors run on very low voltage. Interference from outside sources is so easily overlooked. A shared power source. A misplaced bundle zip tie wrapping a high voltage/high amperage wire bundle with some sensor wiring... a high resistance ground.
I'd leave no wire untouched. I'd review the power supply to the ECU and I'd make sure it's supply is conditioned by the battery. Basically I'd be putting a fresh set of eyeballs on every single facet of the wiring and placement of the components. There's something going on here and ya just have to find it. If nothing else you'll sleep better knowing you gave it a good look-see.
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