Manufacturer Code Charts: 4754

4754 - P2203

Information saved in
DDE

Fault code
4754 - P2203

Fault text
DDE: Nitrogen oxide sensor upstream of SCR catalytic
converter, NOx range: upper physical limit exceeded

Fault description
The diagnostic trouble code is logged when the physical
NOx signal from NOx sensor 1 (before SRC catalyst) is
greater than the limit value 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 1 (on front side of SCR converter).

Fault effect and breakdown warning
-

Driver information
Warning light:
MIL

Service instruction
none