| Fault Code Description |
|---|
|
Dynamic monitoring of NOx sensor before SCR catalytic converter. Dynamic monitoring evaluates the time characteristic of the sensor signal during the transition from load to overrun mode. With an intact sensor, the signal delay must not be greater than a limit value. Limit value: Between 1 s and 4 s (depending on variant). |
| Fault Code Conditions | |
|---|---|
| General Conditions |
The monitoring only takes place when the following conditions are met: - The status of the NOx sensor is valid. - No fault code is logged for the NOx sensor and exhaust gas recirculation. 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): between 3 and 50 (depending on variant). |
| Service Plan |
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|
Replace the NOx sensor before SCR catalytic converter. |
| Fault Impact |
|---|
| Warnings | |
|---|---|
| Warning Lights |
None |
| Control Center Messages | |
| Service Notes |
|---|
|
If a nitrogen oxide sensor is replaced, the following service function must be carried out: SCR system adjustments and adaptations, SCR exhaust emission sensor system. |