P040B

4C51 - P040B

Information saved in
DDE

Fault code
4C51 - P040B

Fault text
DDE: Temperature sensor after exhaust-gas recirculation
cooler, plausibility: Temperature after exhaust-gas
recirculation cooler not plausible in rel. to remaining
temperature signals

Fault description
The measured variables from the air-temperature sensors are
checked against each other for relative plausibility. The
DTC is logged when the exhaust-gas temperature
downstream from the EGR cooler is implausible relative to
all of the other measured values.

Condition for fault identification
Test condition:
The monitoring routine executes once per driving cycle in
the cold-start phase.
Voltage condition:
The monitoring routine executes once per driving cycle in
the cold-start phase.

Condition for fault memory entry
Debounce (50 ms)

Action in service
Replace exhaust-gas temperature sensor downstream from
EGR cooler.

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

Driver information
Warning light:
MIL

Service instruction
none