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Making a long story short, it was the o2 sensor that was the issue.
Did you replace both pre-cat O2 sensors? I can give that a try, since it's easier than getting my ECU flashed. Although I do know I'm a few revs behind, and need to get that done at some point.
 

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Just remembered to follow-up on this thread. I took my car in to the local indie shop and they determined the fuel pressure was out of spec at the rail. Since the regulator isn't a separate orderable part, you have to replace the whole thing if it's bad. But before doing that, I had them update the ECU firmware to the latest available, and after that, it cleared up both the P0172 and P0175 codes. Maybe the newer revision is a bit more lenient on fuel pressure, but so far, after about 500 miles, the CEL hasn't come back.
 

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Reading this thread reminds me of my first 2017 Evora 400. All kinds of codes including MIL, bank too lean, etc. Never did manage to hunt them all down.
 
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