4B9C - P2002 (DDE)

4B9C - P2002

Information saved in
DDE

Fault code
4B9C - P2002

Fault text
DDE: Particulate-filter system, plausibility: Particulate-filter
efficiency too low

Fault description
Monitoring of particulate filter efficiency. When the value
for measured soot mass is lower than the limit value 0 g the
diagnostic trouble code is logged.

Condition for fault identification
Test condition:
The error check runs when the simulated soot mass rises
above the limit value 0 g.
Voltage condition:
The error check runs when the simulated soot mass rises
above the limit value 0 g.

Condition for fault memory entry
-None.

Action in service
1. Inspect to determine whether filter could be removed
(carbon accumulation at tailpipe tip).
2. If soot is present on the end of the tailpipe and the end of
the filter then the filter is defective.
3. If no soot is visible in these places, but the diagnostic
trouble code is still logged, the hose may have separated
from the differential-pressure sensor or the differential-
pressure sensor may be defective (in which case a diagnostic
trouble code would also have to be logged for the
differential-pressure sensor).

Fault effect and breakdown warning
Proceed to the nearest BMW Service facility.

Driver information
Warning light:
KEINE

Service instruction
If the differential-pressure sensor is defective then a
diagnostic trouble code for the differential-pressure sensor
would also be stored.