Oxygen Sensor Diagnosis

[tex439]

hi guys,
I have the Toyota Glanza Turbo EP91 model.

i want to ask something about my oxygen sensor because it has a long time that I go from engineer to engineer and from electrician to electrician, I have indignation with them.
I want to ask and tell me how can i check my oxygen sensor if working or not, and how to make the diagnosis.
First time I went to a mechanic and told to me that is okay, then i went an electrician and told to me that he has a problem, then I went to control of exhaust gas and it said to me that it just passes.

now who says the truth?? and who I believe? I am very tangled.
P.S (if sensor it has problem it turns on the sign of check engine or not ???)

thanks guys and sorry for my bad English.

 

[glanzanut]

I would imagine if it is passing an emissions test then its fine.
If you still want to test it though, you can use a multimeter to test the voltage coming back from the sensor.

 

[tex439]

yes i want to check, test by me, but i want to know where i put the 2 terminals of my multimeter (because only one wire have) and how many voltage it should it has???

btw my car now have about 160.000km the oxygen sensor resist until this kilometers???