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The wide band sensor is basically a chemical battery that measures the partial pressure of O2 in the exhaust gas. In the case of rich mixtures it measures the amount of oxygen it must pump through the sensor cell to reach the stoichiometric reading. Because unlike affordable widebands, they do...

The lambda reading of a wide band is completely fuel independent. It is simply a measure of the free oxygen concentration in the combustion gases. The sensor neither knows or cares what you are burning all it is measureing is the unburned oxygen concentration. A lambda 1.0 on gasoline and a...

E85 mixtures That is a very important issue if you are running a high power tune. If you just want a good safe daily driver tune (high 90+ octane fuel) you don't need to worry all that much about it. E85 can actually have a range of fuel blends depending on where you live and what season...

Hi folks, my first post here but thought I would comment on this thread. For background I am the guy on the Subaru board NASIOC that did the E85 FAQ over there. A wideband O2 as mentioned above only measures the lambda reading which is independent of the fuel you are burning. Lambda 1.0 is...