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No luck with search. Will keep it as straight forward as possible.

'03 supercharged

Got an SES, code 0132 - right upstream o2 sensor

Was away from tools and not able to replace for a bit

Had used 87 for a few tanks but a little time after getting code switched to 93

Within 1.5 tanks code went away on its own

Did using the correct fuel likely solve the issue, or do I still need to worry about replacing the sensor?
 

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It's possible; the VG33ER engine doesn't do well on 87 octane gasoline. It's also possible you have a "lazy" sensor. If you had access to a scan tool, you could graph the O2 sensor signal. Otherwise, erase the code and stick with premium fuel and address the sensor if the code returns. Also, if you have a cracked manifold that is leaking, that could also trigger the code.
 

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Eh? Wouldn't paying to fix the sensor be cheaper over time than buying more expansive higher grade of gas long term?
 

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The VG33ER engines require 91 octane fuel or better. If you run lower octane, they will knock and cause the ECM to cut the boost via the boost solenoid, which just sucks all of the power out of the engine. Obviously, if the engine has a bad oxygen sensor, it should be replaced. The poster states that the code was triggered while the engine was using 87 octane gas and then when it was switched to 93 octane, the code went away. So, by that, it's hard to say if the oxygen sensor code was caused by a faulty sensor or because the wrong gas was used in the vehicle.
 

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91 is good for all vehicles. If you buy 87 at least get ethanol free.
 
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