Nissan 370Z Forum - View Single Post - Getting Air/Fuel ratio out of Nissan Data Scan (NDSIII)

SonicVQ · 06-23-2021, 09:21 AM

I don't have NDSII, but I do have NDSIII Lite...

NDSIII Lite does have "WB Sensor 1/2", which is the wide band O2 sensor (aka air/fuel ratio sensor) BUT the value is in volts and not lambda or AFR.

Most of the AFR sensors Nissan uses indicate stoichiometric (14.7:1) at 2.20 volts, but that doesn't tell you much, like how rich or lean the fuelling is. It is not a linear relationship, so you can't use slope/offset to calculate it... it needs a lookup table.

BUT you can use Torque Pro or OBD Fusion and add it as a gauge on the dashboard.

Starting in 2008, AFR is a standard OBD PID and depending on how you configure the app, you can display it in AFR or (the better!) lambda.

This will work for your 2014, but I don't think you will see the "O2 Sensor Lambda" for your 2007.

06-23-2021, 09:21 AM	#3 (permalink)
SonicVQ Base Member Join Date: Jan 2016 Location: Ontario Posts: 230 Drives: G37 Sport Rep Power: 6720	I don't have NDSII, but I do have NDSIII Lite... NDSIII Lite does have "WB Sensor 1/2", which is the wide band O2 sensor (aka air/fuel ratio sensor) BUT the value is in volts and not lambda or AFR. Most of the AFR sensors Nissan uses indicate stoichiometric (14.7:1) at 2.20 volts, but that doesn't tell you much, like how rich or lean the fuelling is. It is not a linear relationship, so you can't use slope/offset to calculate it... it needs a lookup table. BUT you can use Torque Pro or OBD Fusion and add it as a gauge on the dashboard. Starting in 2008, AFR is a standard OBD PID and depending on how you configure the app, you can display it in AFR or (the better!) lambda. This will work for your 2014, but I don't think you will see the "O2 Sensor Lambda" for your 2007.