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O2 Sensor options

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I"m having some fine tuning issues with my SDS system, getting a O2 sensor "error". In 5th gear 2750rpm, the O2 sensor was fluctuating from .14 to .56V as well as a few values in between. I've got a Monza header and welded the bung in the top collector. The sensor is a two wire, and was wondering if one with it's own heater might make a difference? I think the combination of the header and the cool Canadian winter isn't so good for an accurate reading? Or do I have bigger problems?

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