4D71

4D71 - P0545

Information saved in
DDE

Fault code
4D71 - P0545

Fault text
DDE: Exhaust-gas temperature sensor before catalytic
converter, range: upper physical limit exceeded

Fault description
When the physical sensor signal for the pre-catalyst exhaust-
gas temperature rises above the limit value 790 �C the
diagnostic trouble code is logged.

Condition for fault identification
Test condition:
The error check proceeds continuously in the programmed
process grid.
Voltage condition:
The error check proceeds continuously in the programmed
process grid.

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:
Replace exhaust-gas temperature sensor before catalytic
converter.

Fault effect and breakdown warning
-

Driver information
Warning light:
MIL

Service instruction
none