Toyota oxygen sensor not showing right?

Julius Nolin · Post by **Julius Nolin** » Tue Mar 22, 2022 2:07 pm

Hello,

Toyota Yars 2012 1NR-FE

I'm stuck with things I can not trust. Toyota oxygen sensor before and after catalytic converter shows unreasonable. I've read one there and can not remember what I did wrong. maybe some sharp person here who can help me.

blue is before cat and red is after. This is what I get. heated or not. There are zirconia sensors both before and after. but it was something special (check picture)

I also have a file from my measurement that I have added. I have not uploaded it to the library as I am very skeptical if I have done the right thing. feel free to provide feedback so maybe this can be resolved.

victor2k · Post by **victor2k** » Tue Mar 22, 2022 4:41 pm

Hello,
From air/fuel sensor you can measure -0.36 mA current at air -fuel ratio 13 ,0 mA at fuel-air ratio 14.7, ,0.36 mA at fuel-air ratio 17.7.This current is pumped by ECU in sensor circuit to keep voltage at 0.4 v between AF+ and AF-,better use a scan tool to read air/fuel ratio,even with K2 clampmeter you will have a lot of noise.
Best regards

PicoKev · Post by **PicoKev** » Tue Mar 22, 2022 8:49 pm

Have a look at this:

https://www.youtube.com/watch?v=UdbZfXMMTQs

Julius Nolin · Post by **Julius Nolin** » Wed Mar 23, 2022 1:36 pm

Hello,

Thanks for the quick answers. it turns out that the more you know, the more you know you do not know. I study further

PicoKev · Post by **PicoKev** » Wed Mar 23, 2022 4:37 pm

Julius,

In life in general and in this profession especially, the studying new stops.

leonardorj · Post by **leonardorj** » Sat Mar 26, 2022 9:31 pm

As indicações para medir sondas A/F são via scanners para uma melhor conclusão.

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