Re: Racepak o2 sensor
If you have a good volt meter IE Fluke or equivalent you can check it your self. You did not say what the application is but the voltage numbers will change very rapidly and depending on fuel mixture will range between .8 to .3 volts. You can make the fuel mixture rich or lean and see if the O2 sensor responds. Heated O2 sensors in my opinion are pretty tuff and take some extreme conditions to ruin them.
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