O2 Sensors

[rutland32]

does anybody know what voltages the in and out o2 sensor voltages should be on a warm engine at tick over?

I have a 1.0 Gl

Thanks

[Bee]

Assuming we are talking about the oxygen sensor ahead of the catalytic converter, the answer is 450mV with a voltmeter. However, it is very much more involved than a single number, read on...

How it works?

http://auto.howstuffworks.com/question257.htm

How to tell if the sensor itself is damaged?

Also the crucially important correct oxygen testing procedure.

http://makeashorterlink.com/?P53F228AC

http://makeashorterlink.com/?H64F238AC

This is just to show that using a voltmeter for the test is really a compromise; an oscilloscope is the better tool and its tracing looks like this:

http://www.picotech.com/auto/waveforms/lambda_zirconia.html

If the sensor is of the less common (but quicker and more accurate) variety of titania:

http://www.picotech.com/auto/waveforms/lambda_titania.html

--

Bee.