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Originally Posted by Blue Bowtie
Technically, GM PCMs don't fully "ignore" the inputs when in Open Loop Mode or PE Mode (or even in Backup Fuel and Spark Modes) but don't use the input data to modify outputs. If you want to verify that, strap your car on the treadmill/dyno, run it at WOT, and unplug a primary OČ or the MAF.
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The difference between knowing there's a signal and not using it or the controller throwing it's toys because it knows something is missing.
The MAF is required to run even in open loop as that's a driving signal, but the O2 sensors are only a modifier needed to run closed loop.