Nissan 370Z Forum - Both upstream o2 sensors at 2.0v+?

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- - Both upstream o2 sensors at 2.0v+? (http://www.the370z.com/engine-drivetrain/138299-both-upstream-o2-sensors-2-0v.html)

Snusk

10-29-2022 10:52 PM

Both upstream o2 sensors at 2.0v+?

I thought the safe zone is around 0.1 to 0.9?

https://i.ibb.co/zhgvzdW/20221029-174126.jpg
https://i.ibb.co/CM3YMmv/20221029-174120.jpg
change to uppercase in word

SonicVQ

10-30-2022 09:17 AM

The pre-car "O2" sensors are actually Air/Fuel Ratio sensors (aka wide band) and have a different output voltage that ranges from 0 to just over 4 volts.

The post-cat O2 sensors are the older/cheaper narrow band and output a voltage between 0 and 1.0v.

From the screen shot, your air fuel ratio is:
1/Equiv ratio * 14.68 which calculates to 14.70... right where it should be for idle.

Snusk

10-30-2022 06:45 PM

Thanks brother!

SonicVQ

11-13-2022 02:04 PM

Seems like you are enjoying your new scan tool :)
You might want to watch this video by OBD4Everyone. It explains all of the standard OBD PIDs on a G37... which should be exactly the same as the Z, or any VQ37

Nissan & Infiniti 3.7 litre V6, All Engine Sensors Explained: OBD4Everyone Ep.18
https://youtu.be/CXDX-89_ArU

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