4ABA

4ABA - P242A

Information saved in
DDE

Fault code
4ABA - P242A

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

Fault description
Plausibilization of exhaust-gas temperature sensor before the
SCR converter. For the plausibility check the exhaust-gas
temperature value before the SCR converter 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 are implausible relative to the data 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 before SCR
converter.

Fault effect and breakdown warning
-

Driver information
Warning light:
MIL

Service instruction
none