P14A7

481A - P14A7

Information saved in
DDE

Fault code
481A - P14A7

Fault text
DDE: Particulate-filter system: Particulate filter heavily
clogged (exhaust-gas back-pressure above maximum)

Fault description
Particulate filter overload detection. The monitoring
function detects the error as follows:
1. The error is detected when the differential pressure rises
above a specific threshold.
The threshold is calculated from a program map and uses the
parameters rpm and injection quantity.
2. The error is recognized when the flow resistance rises
above a threshold. The threshold is calculated from a
program map and uses the parameters rpm and injection
quantity.
Note:
Because excessive soot accumulation within the particulate
filter can lead to overheating during thermal regeneration,
when this fault occurs the regeneration process is
deactivated once the soot mass reaches a certain level.

Condition for fault identification
Test condition:
Continuous, for enable conditions see defect and self-
healing description
Voltage condition:
Continuous, for enable conditions see defect and self-
healing description

Condition for fault memory entry
Debounce (20000 ms)

Action in service
1. Check oil level and change intervals, correct oil level or
perform oil change as indicated.
2. Check swirl valves.
3. Check exhaust backpressure.
4. Check particulate filter (visual inspection of end pipe and
ceramic filter element).
5. Conduct regeneration (possible only during steady-state
operation lasting at least 30 minutes. The appropriate service
function must be employed to trigger regeneration when this
error is present).

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

Driver information
Warning light:
MIL

Service instruction
After replacing the particulate filter carry out the
corresponding service function!