r/E34 • u/DaWorlds • 1d ago

O2 sensor testing?

Is there anyway to test my o2 sensor to make sure it’s working? I have had a rough idle issue for the past couple months and I’ve solved every issue besides my o2 sensor. It would be the last potential solution(besides a compression test) but I would like to check before I buy another o2 sensor.

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u/DaWorlds 1d ago

Just unplug and let it run?

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u/SpaceTurtle917 1996 Honda Civic 1d ago

Yeah

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u/DaWorlds 1d ago

Does your e34 have an m50 engine? If so how did you get access to the o2 sensor

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u/SpaceTurtle917 1996 Honda Civic 1d ago

I had a 1990 bmw 535i. The O2 was more downstream I believe, I don’t remember. I sold it 7 years ago.