4ABB

4ABB - P042A

Information saved in
DDE

Fault code
4ABB - P042A

Fault text
Exhaust-gas temperature sensor before particulate filter,
plausibility: Exhaust temperature before particulate filter not
plausible when compared to the other exhaust temperature
signals

Fault description
Plausibility check on exhaust-gas temperature sensor before
the particulate filter. For the plausibility check the exhaust-
gas temperature value before the particulate filter is
compared with the other exhaust-gas temperature data, then
sensor plausibility is determined by calculating the
differences.
The diagnostic trouble code is logged when the monitored
sensor's data display 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 pre-particulate filter exhaust-gas temperature
sensor.

Fault effect and breakdown warning
-

Driver information
Warning light:
MIL

Service instruction
none