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So are you saying the duty cycle is what changes when AFR changes, and not the amplitude?
I could easily program a microcontroller to modify the duty cycle, but it would have to be based off of the primary O2 sensor. All I would need to do would be to splice a wire from primary O2 output and set it to an input on the microcontroller. From there the microcontroller could analyze the signal and output the appropriate duty cycle. The microcontroller's output signal would replace the output signal from the secondary O2 sensor, and it would be fed into the ECU. I guess I could do the same with an analog output if the signal is voltage-based and not based on duty cycle.
I need to dig into how O2 sensors work. How can they alter the duty cycle with changes in the AFR? I would think it would need some kind of processor onboard, and I don't think they have them.
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