This comes up quite a bit. And I still haven't figured out a good solution, but here is what I know.
sr20det.nismo.org states that an 86 Z31 o2 sensor is the same. I believe this is only true for a the S14 engine.
The early 90's nissan pathfinders seem to have the same 02 sensor w/ a longer cable. I've seen pictures on partsamerica.com and it looks like the same 02 sensor but I haven't gone down to an autoparts store to check it out.
phase2motortrend.com imports the right 02 sensor, but the last I checked, there were out of the S13 sensor.
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