P22A0

472F - P22A0

Information saved in
DDE

Fault code
472F - P22A0

Fault text
DDE: NOx sensor after DeNOx cat., range NOx: lower
physical limit undershot

Fault description
The diagnostic trouble code is logged when the physical
NOx signal from NOx sensor 2 (behind SCR converter) is
less than the limit 1650 ppm.

Condition for fault identification
Test condition:
The test routine is executed when a valid NOx signal has
been received.
Voltage condition:
The test routine is executed when a valid NOx signal has
been received.

Condition for fault memory entry
Debounce (2000 ms)

Action in service
1. Check wires and plug connections.
2. If wiring and plug connections are OK:
3. Replace NOx sensor 2 (behind SCR converter).

Fault effect and breakdown warning
-

Driver information
Warning light:
MIL

Service instruction
none