4B3B - P229F (DDE)

4B3B - P229F

Information saved in
DDE

Fault code
4B3B - P229F

Fault text
DDE: Nitrogen oxide sensor downstream of SCR catalytic
converter, short circuit to B+: Short circuit to positive

Fault description
The diagnostic trouble code is logged when the signal from
the NOx sensors behind the SCR converter rises above the
limit 2.

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