If you want to confirm things, swap the driver and passenger side O2 sensors, drive it, and see if the code follows the sensor. If you order the part tomorrow you'll be good until it comes in. (edit: I misread, I see now that it's the post-cat sensor - that's even less important)
Agree that the O2 socket tool is helpful and worth it.
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'99 986 Ocean Blue Metallic
'87 924S, winter beater
'17 VW Golf Sportwagen, for when I need extra seats
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