both wideband and narrow band lambda probe detect excess oxygen and provide voltage output on this base. then they use lookup table for voltage-lambda value for lambda calculation. and then, AFR is calculated by adjusted parameter for specific fuel from lambda value...only different is in voltage to oxygen ratio curve...
as narrow band provide only very rapid change of voltage, it can be used only for stoich ratio (there is sudden voltage change appear) measurement, while wideband provide much more wide voltage change, so can be used to measurement of wide ratio of oxygen...
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