O2 sensor bad? Just double check my methodology please

[paanta]

'91 535i.

Digital voltmeter between pins 1 and 2. Voltage with car running sometimes goes over 1.2 volts at startup? Is that normal? I thought they were supposed to sit between 0 and 1 volt.

Bad O2 sensor? Generic 4-wire Bosch spliced into the harness is OK, I also assume?

Thanks!

[yaofeng]

I did a check on the O2 sensor on my 95 525i recently because it failed the NJ emissions inspection.

http://www.bimmerboard.com/forums/posts/611265/

If it is the same the fall back position of the O2 sensor is 0.5 volt. If you use a digital multimeter the reading will fluctuste in response to throttle.