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I agree that the OEM front O2 sensor, the limiting-current type Denso A/F sensor, does not have the same range as a Bosch LSU pump-cell type. For applications where you don't need to go super rich (basically, non-boosted) it will still read accurately. Now if the front o2 sensor output the same style signal as the rear o2 sensor (oscillating 0-1v), then you could easily call them both narrowbands.
Use the right tool for the job, that's all.
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