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yes def does have a shelf life, but there are so many vehicle using it that I doubt if old def caused the issue, having said that ,my job at work is soley diagnosing and repairing cummins and Detroit aftertreatment systems and most time the problem is with the wiring as freightliner as several issue's of wiring harness being pulled to tight and rubbing through and yes nox sensors do act up by drifting high or low called an in-range nox drift
when that happens the systems gets knocked of balance as the inlet nox must be reduced by 80% if either nox sensor is off by more then 10% then it starts throughing nox conversion codes and can slightly derate to 55mph and next step is called a scr driver induce derate which limits the vehicle to 5mph and kicks on the red stop light, unfortunly they are about 500-600 dollars to replace but ,they can run a scr test to see if both sensors read within 5ppm of each other
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