P2202

4759 - P2202

Information saved in
DDE

Fault code
4759 - P2202

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

Fault description
The diagnostic trouble code is logged when the physical
NOx signal from NOx sensors 1 (before SCR cat) is less
than the specified 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 1 (on front side of SCR converter).

Fault effect and breakdown warning
-

Driver information
Warning light:
MIL

Service instruction
none