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20 years ago, Fred from Electromotive told me something I will never forget: "an Air/fuel Sensor ratio doesn't read air/fuel ratio. But rather oxygen presence in the exhaust and that they are all calibrated differently," Simple and obvious but after some thought you begin to realize that focusing on a number or comparing one sensor to an other and calling one "inaccurate" is faulty logic. What you want is repeatability above all else. If you know that the you get most knock resistance with best power X:1 nominal AFR with Y sensor, you shoot for that assuming you don't make any big changes to overlap or boost pressure. That may equate to Z:1 AFR on another sensor but that doesn't matter.
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