4ABD - P0425 (DDE)

4ABD - P0425

Information saved in
DDE

Fault code
4ABD - P0425

Fault text
Exhaust-gas temperature sensor before cat., plausibility:
Exhaust temperature before SCR catalytic converter not
plausible when compared to the other exhaust temperature
signals

Fault description
Plausibility check on exhaust-gas temperature sensor before
oxidation catalyst.
For the plausibility check the temperature before the
oxidation catalyst is compared with the other exhaust-gas
temperature data, then the sensor plausibility is determined
by calculating the differences.
The diagnostic trouble code is logged when the monitored
sensor's data displays implausibility relative to that from the
remaining sensors.

Condition for fault identification
Test condition:
The error check runs once per driving cycle once an engine
cold start is detected and provided that the barometric
pressure is above 750 mbar.
Voltage condition:
The error check runs once per driving cycle once an engine
cold start is detected and provided that the barometric
pressure is above 750 mbar.

Condition for fault memory entry
Debounce (100 ms)

Action in service
Replace exhaust-gas temperature sensor upstream from
oxidation catalyst.

Fault effect and breakdown warning
-

Driver information
Warning light:
MIL

Service instruction
none