4729 - P229F (DDE)

4729 - P229F

Information saved in
DDE

Fault code
4729 - P229F

Fault text
DDE: NOx sensor after DeNOx cat., plausibility lambda:

Fault description
Plausibility check on NOx sensor (sensor 2 behind SCR)
lambda signal in coasting/overrun mode. If the lambda
signal falls below the limit value 0 the error
DFC_NoCat2DsLamPlausMin is recognized.

Condition for fault identification
Test condition:
The following conditions must be met before the error check
can be active: Sensor diagnosis is active: ==TRUE. No
errors related to the linear lambda signal are reported
DINH_stFId.FId_NoCat2DsOvrRunPlaus .5==FALSE The
vehicle is in coasting/overrun mode ( ==TRUE) for the
period 5000 ms The error check proceeds continuously in
the defined process grid provided that diagnosis has been
enabled.
Voltage condition:
The following conditions must be met before the error check
can be active: Sensor diagnosis is active: ==TRUE. No
errors related to the linear lambda signal are reported
DINH_stFId.FId_NoCat2DsOvrRunPlaus .5==FALSE The
vehicle is in coasting/overrun mode ( ==TRUE) for the
period 5000 ms The error check proceeds continuously in
the defined process grid provided that diagnosis has been
enabled.

Condition for fault memory entry
Debounce (2000 ms)

Action in service
Check of NOx sensor.

Fault effect and breakdown warning
-

Driver information
Warning light:
MIL

Service instruction
none