nox sensor trouble

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  1. Rambo 7007

    Code 2201

    2013 Ram 2500, 58,000 miles. Throwing code 2201 upstream nox sensor circuit. Could not see any problem with connections. Replaced sensor with aftermarket part (Dorman). Code came back. Freeze frame not much help. Live data shows nox level running 200-300 ppm during normal driving until...
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