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I guess I was wrong about how the o2 sensors work on the SVT, a lot of other cars with a dual bed (single housing) cat will have a front sensor with that swinging voltage wave and a rear sensor with more of a flatline.
So the graph shows a reading of the new rear sensor, and you don't have a CEL on again yet right? I got sidetracked by the fluctuations of the rear sensor and skipped the part about you driving 20 miles without a new CEL. If that's the case it's fixed and operating correctly, those are monitored continuously as soon as they are hot enough, after a minute or two of running and relaxed driving.
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