[HardcoreZ28]

To be more specific on the wideband reading it gives you a much more accurate measure of your air:fuel ratio. Older technology such as OBDI used an O2 sensor that switched between lean and rich fairly slowly and gave an overall general picture of the ratio. Newer OBDII cars run an O2 sensor that is much more precise and samples the air at a much much faster rate allowing you to pinpoint and fine tune your AF ratio at pretty much every RPM on the scale.