I decided to replace both oxygen sensors. With the new sensors in place I re-ran the test and I'm getting all the way down to 0mv when the throttle is released.

The 02 sensor waveform and cross counts are better (about 2 per second at idle) but I'm not sure this is going to solve my P0410 problems.

I'll keep my fingers crossed and let you know in a month or two if the P0410 reappears.

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