Is your car a wagon? Our radio code is written on the inside of the rear liftgate door (drivers side) visable when the door is up. The PO didn't write it there and looks like it was done at the factory but maybe not. You might look around there or maybe inside the trunk on a sedan.
Go with the Bosch sensor and make certain is is the right one for your engine. After market sensors often generate low voltage. Don't know why the additional wiring harness on the 97. Check FCPGroten's site and read the explanation under O2 sensors.
pj
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