4D51

4D51 - P204D

Information saved in
DDE

Fault code
4D51 - P204D

Fault text
DDE: Reducing-agent pressure sensor, range: upper
physical limit exceeded

Fault description
The diagnostic trouble code is logged when the physical
sensor signal for reduction agent pressure rises above the
limit value 7800 mbar.

Condition for fault identification
Test condition:
The monitoring function is only implemented when no
electrical error is logged.
Voltage condition:
The monitoring function is only implemented when no
electrical error is logged.

Condition for fault memory entry
Debounce (10000 ms)

Action in service
1. Check wires and plug connections.
2. If wiring and plug connections are OK:
3. Use diagnostic system to check pressure sensor.
4. Replace delivery module.

Fault effect and breakdown warning
-

Driver information
Warning light:
MIL

Service instruction
This fault is the result of a wiring defect.