Testing O2 Sensors

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06-21-2011, 03:00 PM

derekstl

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Testing O2 Sensors

Is there anyway for me to test my O2 sensors? Or do I have to have a scanner or take it somewhere? I think maybe its going bad but I would like to know for sure before I replace it.

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06-21-2011, 03:55 PM

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They read from 150-900mV, you need a scanner to see that voltage.

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06-21-2011, 03:56 PM

mike171562

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A scanner is really the only way you can see how they are firing. I would think though if they were going out, you would eventually get a check engine code