Thread: Question about o2 sensors

Are SR o2 sensors wideband or narrowband?

narrow, i believe.

Most if not all factory o2 sensors are narrow band sensors. I have yet to see a factory wideband o2 sensor.

Some mid 90's honda civics had widebands. The new golf GTI is wideband, along with a ton of subarus.

Interesting! Thanks, I didn't know they had factory wideband o2 sensors. I didn't figure they would waste the time/money to integrate them, but now it makes sense.

Do you know if the Subarus actually use it as a true wideband, or if they're only using the narrowband output?

if the nissan ones are narrow then how can datalogging be accurate?

It's not.

well guess no street tuning for me lol

The new ones use a real wideband signal, but I don't know how much of it is used for factory tuning. They call them air/fuel ratio sensors instead of O2 sensors.

I believe 1995 was when Honda experimented with it in a Civic for tuning purposes.

There are a lot of vehicles that come with them stock now. If you want a generic O2 that is commonly used, (Dynojet, Innovate LM1 etc) then you can get the Bosch unit from a 07 VW Golf GTI.

02 sensors are really only accurate through part of their range. Like 13-15:1 ratios. It reads 0-1V max, higher voltage is more fuel. The wideband uses a 1-5V signal. It reads opposite. 1V would be pig rich, and 5V would be lean.

The stock narrowband should never be used for datalogging because it works over a very limited range, and becomes less accurate at the extremes.

The stock O2 is really only good for small adjustments to the fuel map during closed-loop operation.