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Old 08-20-2006, 08:00 PM
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O2 sensor millivolt range ?

'00 Mazda Millenia, 2.5L V6

I need to know if anybody knows or has the proper operating range in millivolts for the front oxygen sensor.

Thanks in advance.


Larry

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Old 08-20-2006, 08:39 PM
67 Deuce 4 Me's Avatar
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O2 sensor does exactly that....senses oxygen in the exhaust. Normally a fully heated o2 sensor running the engine 2000 rpm should constantly be switching from lean (under 500mv)all the way down to near 0mv, to rich over (500mv) all the way up to 999mv. That would be what you would see on a engine that is running properly. You need to run the engine at 2000 rpm to check this to keep it heated.
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Old 08-21-2006, 03:18 PM
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What Deuce 4 Me said, normal operating range for upstream (or front) O2 sensors is 0-999mV. I don't know the spec on your car, but I believe you should have a fairly steady 400-500mV at idle and the engine has been running for at least 30 minutes, giving the sensors enough time to heat up.

A reputable shop should be able to hook it up to a scan computer that will flag any bad sensor reading. This is usually $50-$100 vs $150+ at a dealer.
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