4BC2

4BC2 - P0101

Information saved in
DDE

Fault code
4BC2 - P0101

Fault text
DDE: Air-mass flow sensor:

Fault description
The error is recognized when the mass-airflow sensor
reports that the mass airflow signal has exceeded the
maximum period duration.

Condition for fault identification
Test condition:
The test routine is executed when mass-airflow sensor
diagnosis is not disabled and the sensor is receiving
electrical power.
The test runs during each process execution.
Voltage condition:
The test routine is executed when mass-airflow sensor
diagnosis is not disabled and the sensor is receiving
electrical power.
The test runs during each process execution.

Condition for fault memory entry
Debounce (50 ms)

Action in service
1. Check wires and plug connections.
(open circuit or short circuits in the signal wire, interruption
of power supply to the mass-airflow sensor)
2. If wiring and plug connections are OK:
Replace mass-airflow sensor.

Fault effect and breakdown warning
The error disables regeneration in the particulate filter.
Proceed to the nearest BMW Service facility.

Driver information
Warning light:
MIL

Service instruction
none