Attention: TDR Forum Junkies 
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 deceleration then goes to over 2000 ppm briefly before going to zero during deceleration. Is this what's tripping the code? If so, what what (besides the sensor) could cause this? Running out of ideas.
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 deceleration then goes to over 2000 ppm briefly before going to zero during deceleration. Is this what's tripping the code? If so, what what (besides the sensor) could cause this? Running out of ideas.
