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, renew the NOx sensor.Proceed as follows to verify that the fault has been rectified:Switch the power off and on with the starter key.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 receives several CAN messages from the NOx sensor in too rapid a succession.
Communication fault between the NOx sensor and the SCR control unit.