o2 sensor voltage at idle?

[mr_nissan]

does anyone know how many volts the redtop o2 should hold at idle?

[mr_nissan]

anyone know the answer?

[ges311]

I was wondering the same thing. My car (s13 sr20 blacktop) is at .8 volts when idling which I think means its running really rich.

[the converted]

You can see the huge range of voltage on the chart. Idling about 14-15.5 is in the range, so there is really no good answer for what the voltage should be.

[mr_nissan]

Ive been doing some research on this and I think I got the answer for the red top at least. There is 2 different types of o2 sensor used in the sr20det, zirconia(fat) and titania(skinny) both give a different reading. The red top (skinny) i believe works on resistance from a power source sent from the ecu and can be measured in ohms from 1000-20,000ohms I was using the fat o2 from the black top and i was getting the Mv reference but it had no effect on my wide band readings I would start out at .5volts then fall to about 47.5Mv so the black top voltage should be about .5 at idle get a wide band and check it out I ordered a skinny o2 from West Covina Nissan(which they've yet to ship or reply to messages in the last few days) for my red top and I hope this will solve the problem.

Modified by mr_nissan at 10:13 PM 9/27/2009
Modified by mr_nissan at 10:14 PM 9/27/2009