4C09

4C09 - P042A

Information saved in
DDE

Fault code
4C09 - P042A

Fault text
Exhaust-gas temperature sensor before particulate filter,
plausibility: Difference, measured from calculated exhaust-
gas temperature before particulate filter, too high

Fault description
The DTC is logged when the difference between the
measured and the simulated exhaust-gas temperature
upstream from the particulate filter lies outside a plausibility
window.

Condition for fault identification
Test condition:
The error check is activated when no other faults are stored
for the sensor.
Voltage condition:
The error check is activated when no other faults are stored
for the sensor.

Condition for fault memory entry
Debounce (60000 ms)

Action in service
Replace pre-particulate filter exhaust-gas temperature
sensor.

Fault effect and breakdown warning
-

Driver information
Warning light:
MIL

Service instruction
Exhaust-gas temperature sensor before particulate filter
defective.