P042E

4C9F - P042E

Information saved in
DDE

Fault code
4C9F - P042E

Fault text
DDE: Exhaust-gas recirculation valve, plausibility:
mechanically faulty near open position

Fault description
If a negative control deviation in the EGR control system
remains present for a period of 1 s, and it proves impossible
to resolve this issue despite attempts to free the valve with
the EGR actuator in the intervening period, the system
recognizes the EGR valve as sticking in its open position.
For this the actual pulse-duty factor of the EGR actuator
must be greater than 3 % or the specified pulse-duty factor
of the EGR actuator less than
EGRVlv_rJamVlvOpnDemMax_C.
A counter is incrementalized in response. This deactivates
monitoring for persistent control deviation.
A diagnostic trouble code is logged when the counter
reaches the limit value 6.

Condition for fault identification
Test condition:
The monitoring function is active only when the monitoring
function for permanent control deviation in the EGR control
is also active and a persistent control deviation has already
been detected.
Voltage condition:
The monitoring function is active only when the monitoring
function for permanent control deviation in the EGR control
is also active and a persistent control deviation has already
been detected.

Condition for fault memory entry
-Debounce time for detection of a negative control deviation
2500 ms+ time for break-away attempts during persistent
control deviation 1 s.

Action in service
Replace EGR valve.

Fault effect and breakdown warning
Proceed to the nearest BMW Service facility.

Driver information
Warning light:
MIL_SVS

Service instruction
With some engine versions the appropriate service function
must be used to reset the EGR valve's adaptation before the
EGR valve is replaced.