Quote:
Originally Posted by SentraSE-R
My Ultra-Gauge has an Air/Fuel ratio display, IIRC. If not, it has direct O2 sensor Bank 1 1 and O2 sensor Bank 1 2 voltage displays. I'll check them the next time I drive the car.
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The voltage is 'at the time of the read'- ODBII is 10400bps.
I'm not sure you'll see the voltage cycle like it should over ODBII.
It continuously goes up to 0.8, and down to 0.2, repeatedly whilst you maintain cruise (i.e. 1800RPM or more, steady throttle, closed loop operation).
At idle, my sensor stays at 0.8 and slows back to 0.2, and cycles slowly (due to volume - idle RPM is low volume).
That'll tell you the O2 sensor is working OK!
The other thing to think of is you'll get a code again if the O2 sensor is useless.
Vacuum style leaks produce O2 sensor codes (air after the AF sensor).