Re: O2 sensor help...
Quote:
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Originally Posted by Hozer 88GTConv
got no voltage on the upper left,
got .67 vdc on the black and got an intermittent 12vdc on the upper right...
sound right? sounds like the 02 is bad...good power, just no signal.
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If this is your key on engine off results, the .67vdc(rich) shouldn't be there.
The 12vdc is in the O2's for heating purposes only, not for signal voltage generation. They react to the presence (or absence) of oxygen in the stream and generate the voltage signal. If engine is off and after a short period of time, the signal voltage from the O2's should be very close to 0.0vdc=very lean=no exhaust fumes.
Check this tech article on its description. Even though it's Audi related, it is a very good description of the O2 sensor.
I think your problem is more a wiring issue first, and a possible set of bad O2's second. Once you get the wiring problem squared and replace the O2's, check them out in a KOER self-test. LUK/GL
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