4BF9

4BF9 - P244A

Information saved in
DDE

Fault code
4BF9 - P244A

Fault text
4BF9Exhaust gas differential-pressure sensor, diesel particle
filter, signal: Open or short circuit to ground

Fault description
Exhaust-gas differential-pressure sensor monitoring. The
diagnostic trouble code is logged when the raw sensor signal
(voltage) is less than the specified lower limit 152 mV.

Condition for fault identification
Test condition:
The test routine is executed only provided that no other
electrical faults are present. The error check proceeds
continuously according to the defined process grid.
Voltage condition:
The test routine is executed only provided that no other
electrical faults are present. The error check proceeds
continuously according to the defined process grid.

Condition for fault memory entry
Debounce (600 ms)

Action in service
1. Check wires and plug connections.
2. If wiring and plug connections are OK:
Replace exhaust-gas differential-pressure sensor.

Fault effect and breakdown warning
The error disables regeneration in the particulate filter.

Driver information
Warning light:
MIL

Service instruction
none