P2209

4922 - P2209

Information saved in
DDE

Fault code
4922 - P2209

Fault text
DDE: Nitrogen oxide sensor upstream of SCR catalytic
converter,:

Fault description
Timeout error in NOx heater temperature message for heater
for NOx sensor before SCR converter.
A message failure is recognized when the sensor is not ready
and no valid status signal is transmitted.

Condition for fault identification
Test condition:
The error is evaluated just once at the start of the driving
cycle after the dew point has been reached and while the
NOx sensor heater diagnosis is activated.
Voltage condition:
The error is evaluated just once at the start of the driving
cycle after the dew point has been reached and while the
NOx sensor heater diagnosis is activated.

Condition for fault memory entry
Event debounced (2)

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

Fault effect and breakdown warning
-

Driver information
Warning light:
MIL

Service instruction
none