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So this is what I've learned about the diagnostic saying that my O2 sensor after the cat converter has internal resistance that is too high. That aft sensor has no effect on engine fuel management or any other operating functions.
The O2 sensor before the cat converter is the important one for controlling those functions. Essentially the sensor after the cat converter is used to determine if your cat converter is functioning as designed. So, I'm in no hurry to replace it.
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