Communication between the NOx sensor after the catalytic converter and the SCR control unit.
Check the electrical cables of the circuit and clean the connectors.If this does not help, check that the SCR control unit receives ignition key voltage (U15) and that there is voltage supply to the NOx sensor control unit.If this does not help, renew the NOx sensor.Proceed as follows to verify that the fault has been rectified:Switch off the power with the starter key, wait for at least 90 seconds and switch on the power with the starter key again. If the fault has been rectified, the fault code becomes inactive. Clear the fault code.Switch the power off and on with the starter key three times in succession at 10 second intervals to extinguish the warning lamp.
What you'll see
No driver-visible symptom recorded.
System reaction
No system-reaction text recorded.
Diagnostic depth
The SCR control unit has no CAN message from the NOx sensor.
Communication between the NOx sensor and the SCR control unit is not working.If the fault code has occurred once, it may be because the NOx sensor has been renewed.If the fault code recurs, it is probably a fault in the voltage supply to the NOx sensor, the NOx sensor, connectors or electrical cables.