Looking at this for failed mot emissions, garage have replaces the NOX sensor after nox heater fault code and no activity on nox live data, I've updated the ecm to the latest software which is required after replacing the nox sensor, checking the nox reading after the update also shows it doing nothing and the voltage static at 0.16.
Gone through all the wiring to the nox ecu and everything checks out ok. Can someone advise what live readings i should be getting on the diag tool for the nox.