I know somehow these two 02 sensors are different to each other. But how? I got these cat off right now and I could not remove this Secondary o2 cuz it's all rusted and the bolt is little bit rounded now. I got a spare one that I wanna install but I got this one off from primary bung?

Does this two differ in resistance when they are in closed loop? Or it does not work at all? I got no dough right now to buy secondary o2 sensor.

any Idea?

 

bump for any opinion.

 

That's a good question. If you use scope you find the wave form of both sensors is different due the cat. If the cat is removed or doesn't work right anymore the secondary O2 waveform is identical to primary. So I would say they should be pretty much the same. At least that's my experience. Try it it should work, I think.

 

thanks

Yeah that's what I thought cuz since the voltage of the secondary is constant it should be fine. But why the secondary o2 sensor is way expensive that the prmary o2 if they are chemically/electrically the same?