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Though I haven't checked, I believe your guess is not so Wild. I've been looking on the web and it looks like that Air/Fuel Sensor is a Wide Band Sensor. I found a web site that talked about Toyota Solara and it indicated the A/F voltage is from 0 to 4 and can be read through the same PIDs you mentioned.
That makes me believe PCMScan will read it because that PID is in the list of items it can record.
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