Wideband Gauges

**Double0me** · 02-28-2011, 07:39 AM

What is the difference between Wideband and Narrowband?.... Besides one being narrow and one being wide. I know it reads air and fuel, but what’s the difference between the two?

**Smittro** · 02-28-2011, 12:02 PM

A wide band gives a more precise measurement of the AFR's.

Whereas a narrow band has less function and gives a more basic less detailed reading of AFR's.

More or less just enough to make it have Idle/driveability and pass emissions..

**Frost** · 03-02-2011, 05:37 AM

The narrowband O2 is only accurate around stoich, which is 14.68-ish:1. This is the leaner mixture level that your car targets in closed loop (light throttle/cruise/etc) and they provide the feedback for the PCM to maintain this range through a process called trimming.

The wideband oxygen sensors can see a much broader range of AFR; typically 10-20:1 (instead of just mid-high 14s like the NBO2) and must be used for WOT AFR measurement.