Both upstream o2 sensors at 2.0v+?

Snusk · 10-29-2022, 11:52 PM

I thought the safe zone is around 0.1 to 0.9?

SonicVQ · 10-30-2022, 10:17 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, 07:45 PM

Thanks brother!

SonicVQ · 11-13-2022, 03:04 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

10-29-2022, 11:52 PM	#1 (permalink)
Snusk Base Member Join Date: Dec 2021 Location: Oahu Posts: 22 Drives: 09 Nissan 370z 6sp Rep Power: 4	Both upstream o2 sensors at 2.0v+? I thought the safe zone is around 0.1 to 0.9? change to uppercase in word

10-30-2022, 10:17 AM	#2 (permalink)
SonicVQ Base Member Join Date: Jan 2016 Location: Ontario Posts: 230 Drives: G37 Sport Rep Power: 6720	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. SwedeZ likes this.

10-30-2022, 07:45 PM	#3 (permalink)
Snusk Base Member Join Date: Dec 2021 Location: Oahu Posts: 22 Drives: 09 Nissan 370z 6sp Rep Power: 4	Thanks brother! SonicVQ likes this.

11-13-2022, 03:04 PM	#4 (permalink)
SonicVQ Base Member Join Date: Jan 2016 Location: Ontario Posts: 230 Drives: G37 Sport Rep Power: 6720	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 Rusty and Pyrodemic like this.

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