4724 - P229F (DDE)

4724 - P229F

Information saved in
DDE

Fault code
4724 - P229F

Fault text
DDE: NOx sensor after DeNOx cat., plausibility lambda:
Oxygen concentration too high with trailing throttle

Fault description
Plausibility check on NOx sensor 2 (behind SCR) lambda
signal in coasting/overrun mode. The error is recognized
when the lambda signal rises above the limit 0.

Condition for fault identification
Test condition:
The following conditions must be met before the error check
can be active:
- Sensor diagnosis is active: ==1.
- No errors in the linear lambda signal have been reported is
not locked.
- The vehicle is in coasting/overrun mode == 1 for the
period 5000 ms.
The error check proceeds continuously according to the
programmed process grid.
Voltage condition:
The following conditions must be met before the error check
can be active:
- Sensor diagnosis is active: ==1.
- No errors in the linear lambda signal have been reported is
not locked.
- The vehicle is in coasting/overrun mode == 1 for the
period 5000 ms.
The error check proceeds continuously according to the
programmed process grid.

Condition for fault memory entry
Debounce (2000 ms)

Action in service
Replace NOx sensor 2 (behind SCR converter).

Fault effect and breakdown warning
-

Driver information
Warning light:
MIL

Service instruction
Replace NOx sensor 2 (behind SCR converter).