P0406

4CA9 - P0406

Information saved in
DDE

Fault code
4CA9 - P0406

Fault text
DDE: Exhaust-gas recirculation controller, position sensor,
signal: Short circuit to positive

Fault description
EGR valve position sensor monitoring function. The
diagnostic trouble code is logged when the raw sensor signal
(voltage) is greater than 3200 mV.

Condition for fault identification
Test condition:
No faults related to the sensor's voltage supply should be
logged.
Voltage condition:
No faults related to the sensor's voltage supply should be
logged.

Condition for fault memory entry
Debounce (220 ms)

Action in service
1. Check wires and plug connections.
2. If wiring and plug connections are OK:
Replace EGR valve.

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

Driver information
Warning light:
MIL

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.