02 sensor on 2009 yaris

[dogsridewith]

Any difference between an "Oxygen Sensor" and this "AFR sensor"? Does it output an analog voltage that can be read with a multimeter?
I ran a multimeter on my carbed 89 Tercel's O2 sensor (only one, in down pipe just below exhaust manifold) and it read so close to spec (.75 volt?) that I wasn't sure of the whole control circuit's function...was something driving that reading to .75 besides oxygen in the exhaust gas?

[Bluevitz-rs]

Originally Posted by dogsridewith

Any difference between an "Oxygen Sensor" and this "AFR sensor"? Does it output an analog voltage that can be read with a multimeter?
I ran a multimeter on my carbed 89 Tercel's O2 sensor (only one, in down pipe just below exhaust manifold) and it read so close to spec (.75 volt?) that I wasn't sure of the whole control circuit's function...was something driving that reading to .75 besides oxygen in the exhaust gas?

Yes an O2 sensor reads 0.0v - 1.0v.

0.0 is lean and 1.0 is rich. I'm not 100% on what afr that translates to but .5v should be an afr of 14.7. It's reading on a car that uses one will bounce up and down because the sensor has a slower response and the ecu with use an average reading to calculate the fuel delivery.

An AFR sensor reads from 5.0v - 0.0, and is opposite to an O2 sensor. It will read much more accurately and has a much wider range and is much faster.

The two sensors are NOT interchangeable.