Fault Information

Fault Code Description
SCR system efficiency monitoring. The fault is detected if the average efficiency of the SCR system falls below a operating point dependent lower limit value.

Fault Code Conditions
General Conditions	Control unit voltage: 9.5 V to 16 V.
Terminal Condition
Driving Conditions

Fault Time Condition
The fault is entered if it has been detected more than the following number of times (fault debouncing counter): 1

Service Plan
1. Check AdBlue quality with refractometer, replace AdBlue. 2. Remove fault code entries on the following components of the SCR system: - Nitrogen oxide sensors - SCR catalytic converter - Diesel particulate filter - Metering module - SCR tank system

Fault Impact
None

Warnings
Warning Lights	Malfunction indicator lamp and Check Control message
Control Center Messages

Service Notes
Carry out the following service functions depending on which components have been renewed: - AdBlue: SCR system adjustments and adaptations, AdBlue (long-term adaptation factor). - Nitrogen oxide sensors: SCR system adjustments and adaptations, SCR exhaust emission sensor system. - Diesel particulate filter: register exchange. - SCR catalytic converter: register exchange. - Metering module: SCR system adjustments and adaptations, SCR metering module. - SCR tank system: SCR system adjustments and adaptations, SCR tank system. The fault cannot be deleted until the DDE has detected a functioning SCR system. For this purpose, correct faults and complete a conditioning run until the Check Control message goes out. The fault memory can then be deleted.

Service Notes

Carry out the following service functions depending on which components have been renewed:
- AdBlue: SCR system adjustments and adaptations, AdBlue (long-term adaptation factor).
- Nitrogen oxide sensors: SCR system adjustments and adaptations, SCR exhaust emission sensor system.
- Diesel particulate filter: register exchange.
- SCR catalytic converter: register exchange.
- Metering module: SCR system adjustments and adaptations, SCR metering module.
- SCR tank system: SCR system adjustments and adaptations, SCR tank system.
The fault cannot be deleted until the DDE has detected a functioning SCR system. For this purpose, correct faults and complete a conditioning run until the Check Control message goes out. The fault memory can then be deleted.