7 codes J1939 system down

[JimT]

(09-10-2020 )tree98 Wrote:  I don't know what caused both sensors to go bad within days of each other, maybe just coincidence?? Did one go bad and short out the other?? Who knows.

Most likely (if I remember correctly) the NOx sensor that you found shorted and blew the fuses also caused damage to this sensor, if indeed they are on the same circuit. Maybe not enough to fry it, but just enough to damage some internal component.